Need to replace my cracked BBC heads casting # 14097088, 118cc open chamber, rectangular port. Sits on Gen VI 502 and my intake is a Vic Jr. airgap. Prefer aluminum, but will consider iron also. I see several sets of BBC heads listed here, but I do not whether or not these will "bolt on" my application (my technical knowledge of heads is a bit "dated"). Any leads on a direct bolt on?