Does anyone know what offset wheel I need for a stock rear end 1989 Corvette? It's a 11 second foot brake car for the kids and has Billet Specialties front wheels and wanted to put matching 15x8 or 15x10 in the back. Called a couple of wheel manufacturers and they said they couldn't help me. Let me know if anyone runs any combo like this. Any help is appreciated.

On a 10" wheel the BS will be either 6.5" or 7.5" Sorry but i don't remember what year it changed. My 85 took a 6.5" BS. Also be prepared the cut the fins off the rear calipers unless you get a wheel specifically designed to clear them, like the Weld RT series. Most tires on a 10" wheel will stick out from under the fender well. I installed grand sport flares on mine with a 325x50 drag radial and it just barely covers them. I think those flares have been discontinued so you might be better off with an 8" wheel.