Restoring a 1967 Mustang into a modern muscle car is all about choosing the right powertrain. The engine is the beating heart of your build, defining its performance, character, and even value on the booming restomod market.

Unlike the modest 140-horsepower V8 that came in a 1967 Mustang, you can now equip your classic with a powerhouse that delivers modern performance while preserving its vintage soul.

Key Takeaways

1. Professional classic car restoration ensures reliability and safety. A restomod is more than cosmetic—it rebuilds every system to modern standards.

2. Customization makes each build unique. A Custom Mustang restomod is tailored to personal style while integrating modern amenities discreetly.

3. Demand for restomods is rising. Limited supply and collector interest strengthen both desirability and long-term value.

4. Peace of mind is priceless. Expert engineering, warranties, and after-sales support protect the investment and enhance ownership.

In this post, we'll explore why your powertrain choice matters and examine the best engine upgrades. These range from a period-correct Windsor V8 to a Roush-tuned crate motor and even an electric conversion. All transform your 1976 Mustang restomod into a true modern muscle car.

Why Your Powertrain Choice Matters in a 1967 Mustang Restomod

Sets the Tone for Performance and Drivability:

The engine you select will define how your restored Mustang drives and feels. It determines your horsepower, torque, and throttle response. In short, it determines how much of a muscle car it really is.

For example, a factory 1960s 302 V8 made only around 140 hp, whereas a modern crate engine or swap can easily deliver 3-4 times that power.

Upgrading the powertrain means your classic Mustang can exceed its original specs in acceleration and speed. This gives you performance that rivals or surpasses modern sports cars while keeping that vintage appeal.

Character and Collector Appeal:

Your choice of engine also shapes the car's character and sound. A classic Windsor V8 burble gives an authentic 1970s muscle car feel, which some purists and collectors love. On the other hand, a new fuel-injected engine offers smooth reliability for daily driving.

Deciding between a period-correct engine and a modern upgrade is a personal choice. Whether you prioritize originality or modern performance. Importantly, a well-chosen powertrain can enhance the Mustang's collector appeal and even its investment value.

Classic car values are on the rise with strong a demand and a shrinking supply of well-preserved models. Restomods are a growing part of that trend. In fact, the whole movement of restoring and modifying vintage cars is fueling market growth. Owners seek to enhance both the aesthetic and functional value of their classics.

Simply put, the engine in your restomod can make your '76 Mustang more enjoyable to drive and more desirable to own.

Investment Potential:

Beyond the thrill of driving, the powertrain can impact your Mustang's long-term value. In the expanding classic car market, many see quality restomods as solid investments.

Modern upgrades like fuel-injected V8s or even electric conversions can broaden the car's appeal to younger enthusiasts and eco-conscious buyers.

High-end restomod builds with reputable engineering tend to hold their value or appreciate. Especially as restomods with modern engines, they often command higher resale prices than stock originals.

In essence, choosing the right engine isn't just a mechanical decision. It's also about building the Mustang that best fits your performance goals and future plans.

Popular Powertrain Options for a 1967 Mustang Restomod

When upgrading a 1967 Mustang's powertrain, you have several exciting options. Below, we break down the pros and cons of four popular engine routes, so you can find the setup that matches your vision for a classic Mustang restomod:

Period-Correct Windsor Small-Block V8

Many restorers consider a Windsor small-block V8 (such as a 302 or 351 Windsor) to keep things old-school and authentic. This is the kind of engine a 1970s Mustang might have run in its day, offering that nostalgic rumble and carbureted simplicity.

• Pros: A period-correct Windsor gives your build a true 1970s muscle car vibe - including the beloved V8 sound and feel us.haynes.com. Keeping a Ford small-block also has strong collector appeal for purists who value matching-era components.
• Cons: Lower output and more maintenance by modern standards might be encountered. These engines made far less power than today's V8s (a stock 1976 302 was ~140-150 hp) and lack modern fuel injection, so they can be finicky. You'll likely face more frequent tuning (carb adjustments, etc.), and potential oil leaks or mechanical wear as these designs are decades old. They also aren't as efficient, so expect lower fuel economy.
• Ideal For: 1967 Mustang Restomods are perfect for purists and vintage enthusiasts who want the original driving character. If you favor nostalgia and collector authenticity over sheer horsepower, a Windsor small-block keeps your Mustang true to its roots. It delivers the analog, old-school driving experience - quirks and all - that takes you back in time.

Modern Ford 5.0 L "Coyote" V8

Swapping in a modern Ford Coyote 5.0 V8 is a popular restomod choice for those craving new-age performance in a classic Mustang. The Coyote is Ford's contemporary DOHC V8 found in late-model Mustangs, and it can transform your 1976 pony into a seriously quick machine.

• Pros: The biggest pros are big horsepower and modern reliability. A latest-generation Coyote 5.0 makes 460+ hp in stock form (more than double the output of the old 302) and comes with electronic fuel injection, computer engine management, and decades of engineering improvements. That means you get smooth idling, easy cold starts, no carb tuning headaches, and generally a turn-key, daily-drivable muscle car experience. Maintenance needs are lower, and parts availability is excellent.

• Cons: Physically fitting a Coyote into a vintage Mustang's engine bay isn't plug-and-play. The retrofit often requires custom mounts and chassis modifications since the engine is larger and taller than the old pushrod V8. The upfront cost of the engine and electronics is higher than rebuilding a classic motor. You'll need to integrate wiring harnesses and ECUs. Additionally, some die-hard classic fans feel the high-tech Coyote lacks the soulful sound and look of a classic engine (it's very different visually from a 1960s V8).
• Ideal For: The Coyote is great for owners who want a retro look but modern performance for daily driving. If you plan to really drive your restomod often (and hard), the Coyote 5.0 offers a best-of-both-worlds solution. It's where a vintage car meets a contemporary drivetrain. It's perfect for those who prioritize reliability, horsepower, and even resale value over keeping everything period-correct.

Roush 347 V8 Crate Engine (Stroker Small-Block)

For a blend of old-school and new, many builders (including ECD Automotive Design) turn to a Roush 347 V8 crate engine. It's essentially a modernized, high-performance version of the classic Ford small-block. This 347 cubic-inch stroker is based on the 302 Windsor architecture. It's engineered by Roush to deliver big horsepower with modern reliability.

• Pros: It's the best of both worlds - vintage heart with modern muscle. The Roush 347 brings serious power (around 465 hp and 425 lb-ft) in a compact small-block package. It has old-school pushrod V8 DNA (and that deep V8 rumble). But better--they are built with forged pistons, roller cam, aluminum heads, fuel injection, and even an 8-stack intake for a classic look.
• Cons: Less "original" than a factory engine and higher cost are just a couple of small downsides. Because it's a crate engine, it's not the numbers-matching motor that some collectors might prefer in a vintage 1967 Mustang. Strict purists could view it as an aftermarket addition (albeit a top-tier one). Upgrading to this level of power may require strengthening other components (transmission, rear axle, etc.) to handle ~465 hp.
• Ideal For: This is for the restomodder who wants heritage with a twist. This is ECD's choice for a balanced approach - it maintains a classic Ford V8 identity while delivering performance that far exceeds anything from the 1970s. If you love the idea of beating modern Mustangs off the line with a carbureted-looking (eight-stack) engine under your hood, the Roush 347 is an exciting option.

Electric Muscle Car Conversion

For a completely different approach, you can turn your classic Mustang into an electric restomod. It's an unconventional but increasingly popular option to swap the engine for electric motors and batteries. Imagine a 1976 Mustang with instant Tesla-like acceleration - that's what an electric conversion offers.

• Pros: Enjoy instant torque, zero emissions, and ultra-low maintenance. An electric motor provides instant power from 0 RPM, meaning your Mustang would launch off the line with neck-snapping acceleration, far beyond what the stock '76 V8 could do. The driving experience is smooth and whisper-quiet. No more loud cold starts or fumes, just seamless power delivery. EV drivetrains also have very few moving parts, so maintenance is minimal (no oil changes or tune-ups).
• Cons: With an electric, you lose the V8 sound and some classic character. For many, a huge part of a muscle car's appeal is the rumble and roar. An electric Mustang has none of that sound, which can create a "sensory disconnect" for enthusiasts used to a loud engine. The conversion process is also expensive and complex. Battery packs, motor mounts, and high-voltage systems require specialist knowledge.
• Ideal For: Forward-thinking owners who want a unique, head-turning restomod with cutting-edge technology like electric conversions. If you're passionate about innovation and don't mind trading engine noise for turbine-like whir, an electric conversion makes your 1976 Mustang a conversation piece.

How Modern Upgrades Retain the Spirit of a Classic Mustang

Upgrading your powertrain doesn't mean losing the spirit of a classic muscle car - in fact, a well-done restomod should enhance the experience without sacrificing vintage charm. Builders take care to ensure that even with modern engines, a restored Mustang still feels like a Mustang:

• Preserving the V8 Rumble: If you choose a gasoline V8 (whether old-school or new), you can retain that throaty exhaust note that defines a muscle car. Modern performance engines can be paired with tuned exhaust systems (like MagnaFlow or Flowmaster setups) to emulate or even amplify the classic sound. For instance, ECD's Mustang builds use custom exhaust tuning so that a fuel-injected 5.0 or Roush 347 still sounds like a 60s-era beast.
• Balanced Handling and Drivability: Modern powertrains often weigh differently than the originals, so expert builders will adjust suspension and weight distribution to maintain the car's balance. An electric conversion, for example, might place batteries strategically to mimic the weight of an engine up front, preserving handling characteristics. Meanwhile, adding power means upgrading the brakes and suspension to match. It's common to fit coil-over suspensions, disc brakes, and stronger rear differentials. That way the car not only accelerates faster, but also corners and stops confidently.
• Modern Comforts, Vintage Style: Part of retaining the spirit is also preserving the classic interior look and driving atmosphere. Restomod builders often hide modern components. Take, for instance, the engine control units or battery management systems, which areout of sight. You can have fuel injection and even modern overdrive transmissions for easy highway cruising, all while the car's cabin maintains a period-correct appearance.

Performance Beyond the Original Specs

One of the thrills of doing a restomod is achieving performance that the engineers in 1976 could only dream about. The late 1970s were the low point of the muscle car era. Emissions rules and fuel crises meant even V8 Mustangs were underpowered. In 1975-1976, Ford's 5.0-liter V8 only produced around 140 hp and 240 lb-ft of torque net. That translated to 0-60 mph times over 10 seconds. That was respectable for the time, but tame by today's standards.

Modern powertrain upgrades completely transform those stats.

For instance, dropping in a Roush 347 or Coyote 5.0 can easily give your Mustang 450-500+ hp, cutting 0-60 times down into the 4-second range (depending on tires and traction). That's true supercar territory and more power than even the wildest Shelby GT500 of the '60s.

Of course, with great power comes the need for supporting mods. High-performance builds will typically include stronger transmissions (such as a modern 5-speed or 6-speed, or performance automatic), fortified drive shafts and differentials, and upgraded cooling systems.

Additionally, as mentioned, you'll want to upgrade the chassis with items like coilover suspension, sway bars, and big disc brakes to handle the newfound speed ecdautodesign.com  Done right, a restomod Mustang accelerates faster, brakes harder, and takes corners flatter than the original.

The end result of a well-executed powertrain upgrade is a classic Mustang that can outperform many brand-new sports cars, all while turning heads with its vintage looks. Imagine a modern BMW or Camaro driver's surprise when a '76 Mustang blows past them on the highway. That's the magic of a restomod.

Investment Appeal: Gearheads and Collectors Alike

Beyond the adrenaline rush, investing in quality powertrain upgrades can increase your Mustang's value in the eyes of both gearheads and collectors. In today's market, classic car values are climbing, and restomods have become hot commodities. Here's why a well-built restomod Mustang can be a smart investment:

• Higher Resale Value: Upgrading to a respected modern engine (like the Coyote or a Roush crate) can make your Mustang more appealing to buyers, compared to a stock-spec restoration. Many enthusiasts want a classic they can actually drive and enjoy without frequent breakdowns.
• Rising Demand for Quality Restomods: The restomod segment has been booming. Younger generations (Millennials and Gen Z) are getting interested in classics, but they often prefer those with updated tech and performance. According to market research, the classic car market is expected to double in value from 2024 to 2032, in part due to restoration and customization trends fueling interest.
• Building with an Eye on the Future: If you build your Mustang with investment in mind, choosing the right powertrain is key. A unique or special engine (for example, an electric conversion or a limited-edition crate motor) can make the car a rare find, potentially increasing its future collectability.

In short, a 1976 Mustang restomod with the best powertrain can offer plenty of joy now and prove to be a savvy investment long-term. Whether you eventually sell it or keep it in the family, the quality will speak for itself.

In the End, It's About Building Your Perfect Mustang

When all is said and done, there is no "one size fits all" answer. The best powertrain upgrade for your 1976 Mustang is the one that aligns with your vision. You might crave the nostalgic shake and sound of a carbureted Windsor V8? Maybe you dream of the turn-key ferocity of a modern 5.0 Coyote?

Perhaps the idea of a high-tech Roush-tuned small-block excites you. Maybe you want to make a statement with an all-electric muscle car conversion. Each path has its merits. That's the beauty of the restomod world. You have the freedom to build your perfect Mustang.

Keep in mind the practical aspects - your budget, how you plan to use the car, and who you trust to do the build. A professional builder like ECD Auto Design can offer the best of all approaches. Expert restorers lend precision engineering with bespoke craftsmanship.

ECD, for instance, specializes in seamlessly integrating modern power (from Roush V8s to EV systems) into classic vehicles. They back their builds with rigorous quality control (and even warranty support) to ensure reliability. This means you can have a 1967 Mustang that's both an exhilarating drive and a dependable machine. It's really the best of the restomod approach.

Ready to Transform Your 1976 Mustang into a Modern Muscle Car?

Don't settle for less than the powertrain of your dreams. Start your ECD Mustang build with a powertrain that matches your vision. Whether it's roaring down the street or silently charging into the future, the choice is yours. Your perfect restomod is limited only by your imagination. So, go ahead and build a legend that's unmistakably yours.