Gents:
Supercars you ask? GM, Ford and Chrylser produced a TON of them from 1954-1973. GM and Dalimer/Chrysler still produce them today! Witness the 2002 Viper, Z06 Corvette and the SS Camaro/Firebird. These are excellent examples of modern day muscle cars. It took the American car manufactors 35 years to get it right...but they finally did!
Check out Floyd Garrett's Muscle Car collection at
http://www.musclecarmuseum.com/ Its' worth your time if you're in the area.
Enjoy your cars.