I found this thread very interesting and timely to say the very least. My 13 year old is working his way through the Grand Turismo 4 game and just last weekend he was asking me what pre-1970 car he should "buy" that would allow him to beat a 427 Cobra in a 1,000 mile endurance race (he did manage to place second to a Cobra with a 454 Chevelle, go figure). I thought for a minute and suggested the 1969 ZL-1 Vette or any Chapparal that would be allowed in that race (turns out none of them).
IIRC he is now running a heavily breathed on 1963 "Split Window" Corvette, and while he hasn't beaten the Cobra yet, he's competitive.