I have just become the proud owner of a mint 1988 29 fever twin. trs drives turning out. 330 mercs all stock, 4 blade hydomotive 21 props. I gps 59mph @ 5000 rpms (11% slip ??) my cruise speed is 40 @ 3500 with full load of fuel and 2 people. My question is do these numbers sound right for this boat? Would I be better with 3 blade or 4 blade props for this boat and does anyone have experience with this old style boat turning the props in vs out? I mostly use this as a lake boat and do a lot of cruising but if there is a better setup for some speed that would be cool to.