Bought Merc 50hp 2003 going to install on 93 Superior Alu. slight V (Jon boat style)with tunnel and pontoons.Boat is 16f with 60" bottem, normal load would be 600#..It came with NO PROP .Any sugestions for Dia.X Pitch for a starter PROP???. Never owned a Merc.so I do not have a feel for there...