Bjorn, I agree, but over the decades the definition of a muscle car changed, mostly because as people realized the quickest and fastest cars of the 60's and 70's were actually pony cars (Mustangs, Firebirds, Camaros, Cudas, Challengers, etc), they simply lump all the pony cars and muscle cars together, and call them muscle cars.

You'd be hard pressed to find a book or article anywhere about muscle cars that doesn't half half of its content dedicated to Hemi Cudas and Challengers, 440+6 Cudas and Challengers, Trans Am's, ZL1 and COPO Camaros, Boss and Mach 1 Mustangs, etc.

The way I see it, our pony cars are greater than muscle cars (by definition), because our cars are pony AND muscle cars, whereas muscle cars (GTO's, Chevelles, etc) are simply muscle cars.