These three overlooked muscle cars all earned obscurity in different ways, from a Hemi Dart built purely for the drag strip to a Rebel Machine unveiled at NHRA’s biggest stage. The Hemi Dart’s 426 engine ran quarter-mile times in the nine-second range not long after leaving the factory, numbers that still hold up decades later. AMC’s Machine countered with a standard 340-horsepower V8 built for straight-line bragging rights of its own. Here’s what made each of these forgotten muscle cars worth a second look.