Which muscle car ruled the streets when it first dropped? The 1966 Ford Mustang absolutely crushed it with over 600k sold in its debut year! But the Camaro, Firebird, GTO, and others weren’t far behind. Check out this list of the 8 best-selling classic muscle cars by their year-one sales—some of these numbers are wild. Which one would you want in your garage? #Cars #MuscleCars #CarCulture