Buick Grand National and especially the GNX, but there was little-known Regal-based turbo-six coupe that preceded them.
There were fast rides before the GTO, but Pontiac made performance affordable, bringing muscle cars to the masses.
Mercury offered big-block V8s, including the famed 428 Cobra Jet, giving straight-line cred without the Mustang badge. Owners ...
Buick's most iconic muscle car, the GSX is also among the rarest. The company sold only 678 units during the 1970 model year.