I currently have two 350 Chevy v8s in my boat( Mercruiser Alpha 1 Gen 2) . Both motors have the complete rear main seal/crank (not two pieces), and the space where a manual fuel pump world be placed is cast over. The cam is a roller. I don't suspect that there is much HP gain due to the roller cam but not having a place to put a manual fuel pump really sucks. Will the current flywheel installed on these motors work on older 350 setup? I quickly realized that the intake manifolds are different with the inbound bolts off center a bit on later model 350s. But, If I have access to an older block, I'd like to know if it would bolt up correctly and match my outdrive housing/flywheel. Would there be any problems mounting coupler????