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Beginning with the 1949 Chevys, they had a 4 3/4 bolt pattern. This bolt pattern was on ALLLLLLLLLLLLLL Chevys (full size, Camaros, Vettes, Novas) as well as all GM A-body (mid size) cars.
I've never been a big fan of the larger diameter (18-22in) wheels, but the width should be OK. I have 15x6 stock GM steel wheels on the front of the 56 and stock 15x7 GM wheels on the rear of the 56 with zero clearance issues.