I am working on repairing my 90 Seaswirl Spyder Sport Omc Cobra 4.3 engine that has a cracked block. I have secured a 89 Chevy 4.3 out of a Sierra truck with a block casting of 10172756. I started to pull and disassemble my old motor and I noticed there are studs holding on my coupler and starting gear. The new block has bolts holding on the gear. My question is, is there more to tear apart or do I add studs to the new motor for bolting my coupler on?