Early A body S6 to V8 swap parts
Don’t let someone try to sell you a “V8 k-frame” ….1963-1966 slant six and V8 are the same. If upgrading to a V8 it’s also a good idea to get V8 torsion bars and bigger 10” or disc brakes…also the stock 7 1/4 rear won’t hold up to a V8 unless you plan to never get on the gas hard.