Todd, they are 72 and later 455. 1238094 is the part number and they all take the longer lower front bolt. If your customer has a 1238094 pass side manifold, you need to give them the long bolt instead of the short bolt.
James, i need the 1383549 driver side, and if you would just pick out a nice 1383648 pass side I will be good to go. PM me pricing please. I imagine shipping will be $50 or so to 31632.
Hi Todd, Yes, those are the 1238094 manifolds that take a longer bolt on the front port (cylinder # 2).