I met a guy a few weeks ago who runs his 81 Camaro in the Cannonball One Lap of America. He has Z06 replica wheels on it with at least 1" spacer / adapters. They bolt onto the hub with regular lug nuts and have a separate set of studs for the wheels to bolt onto.
He runs his car hard and has been running them for the last few years without a problem.
http://www.onelapper.com/photo/photo...3APhoto%3A3725