Bob: i have bought a 350 chev engine from a 1992? 2 ton truck , low hours hardly any wear on parts,bore etc( from recent wreck after engine rebuild (pro?) stock compression ratio i assume, added aluminium edelbrock heads and manifold. what cam and carb would be best for marine application in 20 ft aluminium boat modified vee bottom weighing 5500# what horse power/rpm could i modestly get there is photos of hull at gregg,s site ( amphibian - Rick Gray) thanks for any input Rick