On a scorching-hot Florida highway with co-pilot Tom Humble, Penta drivestop-down in a snarling 1974 Jaguar E-Type. The snarl is emanating not from the car’s original V-12 engine (which purrs more than it snarls) but from a General Motors LT1 “crate” motor producing approximately 460 horsepower. Pressing the accelerator yields a neck snap that is very satisfying, regardless of whether a chiropractor will need to be called later. The car was sumptuously upholstered, rattle-free, and felt like it had always hosted that GM engine.