['97ventureowner]

Any car can have muscle with the proper modifications. The '73 to '77s were still a fairly large vehicle before being downsized due to mpg concerns among others.The true "Muscle car" era ended around 1972 when changes took place within the industry that made the newer models perform less than their earlier counterparts. People can have their own definition of what a muscle car is. You can put a 1970 SB Chevy that has had performance mods done to it and put it in a '78 Monte Carlo as I have done in the past and have a very powerful, fast car. To many that may not be a "true" muscle car but to some, with the engine's horsepower and torque along with it's performance, it could be considered a muscle car.