What about cars that were made specifically for racing in mind. Such as the 57 supercharged thunderbirds (which in my opinion is an overlooked and underated car), they were made specifically to compete against corvettes, hence a factory race car. How about the 64-65 Thunderbolts, awesome factory racer made to go after the Max Wedge cars. Or the 68 Hemi Dart with it's bare bones "gotcha by the ball's attitude". Personally i would rank these cars as Supercars as they are more than just muscle cars.
