The street version of the Eagle GTP Corvette with the optional 621 cid V8 putting out 900+ HP and 900+ lb-ft of torque on pump gas supposedly ran low 9's on street tires. The car weighs 1950 lbs. With the sandard 345 HP Chevy 350 it was signifigantly slower. I think most of the race versions used the Buick Turbo 3.8 putting out about 700 HP.
Road & Track did a couple articles on it back in 1990 or 1991. I still have a copy of one of the articles from their 1991 special Corvette issue.
