I've always found the "Supercar" label to be a gray description. Personally, I go with the factory installed drivetrain cars like the COPO 427's and the LT1 Novas. The dealer transplant(before delivery) are cool as heck cars, but not in the same class as the factory built cars IMO. A warranty replacement 427 for a 396 doesn't even fall into the supercar class because it was after the fact. A Motion converted car isn't nearly as cool as a Baldwin/Motion car. But this is only my point of view on the subject and I'm sure everyone has their own thoughts as well. But a 386 car converted to 427 after a blown engine is cooler than a 396 car with a replacement 396(unless it's an original L89 that was replaced by the factory).
