We never pinned cam bearing in a world/BMP block, use green Loctite and make sure cam fits and turn easy with oil on bearings. We always spray Cometic head gaskets with copper spray and sealer around water passages. The rear/main water passage in the BMP deck was to small , so I machined them bigger . I align honed the main bore to the small side of the spec and ran .003-.0035 main bearing clearance with MS 1795V Bearings . Piston to head .040 with steel rods , we seen contact at .037 . That was with iron block back in the day , Aluminum will grow so we ran the compression higher . Use a compression sheet and play with piston to deck to see what the change will be, Diamond had a nice one I always used. No one will pay for R&D so you have to make the best call on your build and go over everything with a fine tooth comb .