I just bought a 18 ft. 1972 Cheetah Jet Boat & trailer with a 460 for $500. 460 has a crack in water jacket about 4" long. So I decided to get another engine instead. A relative of mine has a 1972 H.O Cleveland that has been professionally built, he is willing to part with it to me for $400. I am having a real hard time finding exhaust manifolds or headers to bolt on to those HUGE exhaust ports. Does anyone have any ideas ? Also 4 point mount system ?