I was thinking. If this has been bored over, there might be good chance that the crank has oversized bearings as well. I will measure and find out. The reason I'm asking is that All the rebuild kits I see have main and crank bearings in them. I would need different ones if I even need them. Since the engine has less than 135k miles on it, would it be too terrible to just change the piston rings and touch up the cylinder bores and get seals? Would you get a new oil pump too?
The mercruiser heads will get new valve seals for sure. I think they are in better condition. (Not as rusty on the outside)