Bought a 360 in boxes. One side of the block is missing the alignment dowel pins/sleeves for the head. Where can I find replacements? Web searches have turned up empty. Only ones I can find that look like it are ones for a BBC. It appears that perhaps the pins/sleeves for a BBC will fit but not sure (Mr. Gasket description lists them as .638/.639 OD to fit a 1/2" head bolt). Would like to find AMC ones before I order a set to try.