340 Cuda
If the cuda is a rust bucket and ready for the heap then I would turn it into a drag car but if its in good shape and a nice restoration is possible Id have to go with moparker. True Formula S cars aren't dime a dozen.
You might look something like this if the cuda is in nice shape,
[ame="http://www.youtube.com/watch?v=n5z_KnpTUnY&feature=player_embedded"]YouTube - Mustang crash at Sydney POwercruise 2009[/ame]