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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.
[/ QUOTE ]Those early Thunderbirds were 2 seat "sports cars" just like a Corvette, sure they were designed with performance in mind, but they were also designed with the intention of being a luxurious, and expensive, "gentleman's car." Those supercharged 'birds are significant cars for sure, but they were simply too luxurious and too costly, not to mention the 2 seat factor, to be considered a musclecar in my opinion. HEMI Dart? Supercar for sure!
