I'm getting a 350 block bored out 40 over and 882 heads already ground with Z 28 springs in it. I'm taking that and a 260 Mercruiser block with crank and cam and all bottom half with the pistons and rods out to a machine shop. He's going to take the 260 apart and make sure the crank is good and the cam is good, If so he's going to take the new block and heads and of course new pistons and rings of the ones he says needs to go in there build the long block then I'll transfere the other parts and install in the boat. Any tips on what I can do to help build a good engine, IE buy certain pistons, rings, lifters, exc, exc.