I'm restoring a 1988 30' Larson. It has twin 4.3 MerCruisers. One has what I think was the head gasket go. Can I replace it with any 205 HP 4.3 mercruiser? The boat seemed a little under powered and the other engine is now showing low oil pressure? I have put a ton of work into the interior and don't want 10K if junk fiberglass.