What are the most popular classic car makes and models?

Defining the American muscle car has become murky over the last few decades. What was once a very strict definition of an intermediate car fitted with a big displacement engine, has shifted to include most American performance cars, with the exception of the sports segments (think Viper, Corvette). In terms of old school muscle, the most popular models include the Dodge Charger, Pontiac GTO, Chevy Chevelle, and Chevy Nova. Late model muscle is more inclusive of cars like the Dodge Challenger, Dodge Charger, Chevy Camaro, and Ford Mustang.