But the Viper falls short of the "cheap body with engine stuffed inside" definition of the GTO's, Chevelles and such like.
I can see the Z06 not being a "classic" muscle car in that theme, nor the S7 (but not because it is midengined) nor the Mosler - the Cobra and Z28/SS and Firebird/Hawk are then as pointed out earlier, the true Pony cars.
The Viper can still lay claim to being the AC Cobra of the modern automotive world though. (not that the Viper is a British sports car, but the SRT-10 is a is from the drawing board of an import guy... right?
)