Currently searching for viable information concerning additional horsepower for a 2002 3.0 Mercruiser. Cust. would like to exceed 200 HP without transplanting a V8 into his pontoon. I have seen the port matched phenolic spacers available from Holley but they only offer 10-15 HP. He would truly love to mount a smaller four bbl onto his existing manifold. Any tips, hints or general speculations would be greatly appreciated.