Well, i was gonna take a used 455 and rebuild it so it would survive in th water at high rpm. Not cost effective! Then thought about a BBC but again, cost of everything needed t do th swap. Well, saw a 18' at lake Mead and was running a 4.6 DOHC. Looked, sounded beautiful and it is fast enuf for me. Just shy of 70 on GPS. He made everything himself and agreed to help me. Under 3K for everything! Engine, ignition, mounts, headers... And he runs all day on around 6 gallons of fuel. If it works as well as hoping, will do same to my 21' Glen Coe also. Will keep everyone posted. You can see his engine on YouTube under Dr DOHC.