I'm running a later wheel...see post above. I'm running 1.5" spacer with long GM wheel studs on front and 2.5" rear adaptors from Vette Brakes in Florida (top drawer...quality). I had the rear frame rails shaved by Jack Cotton and trimmed the rear fender molding to clear my new Michelin Pilot Sport PS2s (295/30-19). No rub!
Conrad