The 1966 Ford Galaxie is one of the most underrated classics of the era, and the engine list explains why: it ran from a 150-horsepower inline six all the way to a 425-horsepower 427, with the brand-new 428 and the one-year-only 7-Litre model sitting in between. Underneath was a coil-sprung rear suspension most competitors did not offer. Read on for what separated the mild versions from the genuinely fast ones.