Will 82 Chevy truck rally wheels fit on a 75 corvette?

No, 82 Chevy truck rally wheels are highly unlikely to fit a 1975 Corvette. The bolt patterns, wheel offset, and center bore will almost certainly be different. Corvettes generally use a smaller bolt pattern and have a different offset than most trucks. You'd need to check the specs of both the truck wheels and the Corvette to be certain, but it's a safe bet they won't fit without significant modification (which isn't generally recommended for safety reasons).