Plymouth sold the 1969 GTX as the muscle car for buyers who wanted power without giving up polish – a blacked-out grille, an upscale cabin, and a 375-horsepower 440 standard with no options required. Only 208 of that year’s 15,602 GTXs left the factory with the legendary 426 Hemi instead. Here’s what it takes to get one of the more common 440 survivors running exactly the way Plymouth intended.