There was a dark horse sponsored by Wimpy’s Antigravitational Machines, campaigning a Z06 at the 2004 national championships: http://www.scca.com/Event/Event.asp?Ref=04-solonats

In a class where anything from the Lotus Esprit Turbo to the Dodge Viper is allowed, the competition is 45 Z06’s, 1 996 and an rx-7.