A clone car is an exact duplicate of another car that was produced. A modified car is a car that has some modifications that weren’t available from the factory. You couldn’t have a 1973 hemicuda clone since there never was such a car . . . in order to clone something, you must first have an original.
A true ‘cuda is one of the three categories of the barracuda line: 1) Barracuda, 2) Gran Coupe Barracuda and 3) ‘Cuda. The Barracuda was the standard model, the gran coupe was the luxury model and the ‘cuda was the performance model. Hope this helps!