Its a 1978 lund with a mercruiser 470. Its a 4 cyl with a ford v-8 head on it so it pushes 170 h.p. The boat is fiberglass and according to N.A.D.A. it weighs roughly 2000 pounds. It has a mercruiser pre-alpha outdrive 1:1.85 ratio (i believe). At WOT the boat will reach 4500 rpm, not sure of speed cuz I dont have a speedometer. Heres the problem; I have a 3 blade prop and it looks like someone bit into each blade mistaking it for a juicy grilled burger. Sometimes while tubing or turning the prop will start to freespin(pushing water easier than catching it and propelling the boat), my question is simple, what prop would any one suggest, please give me the dimmensions, pitch, cup or whatever marine specific things so i can print it off and show it to the marina cuz IM a complete newbie to boats I would like a suggestion for the best size for carrying a fully loaded boat and able to tow a tuber (more tourqe im assumin) and also a suggestion for one that can give me the most top speed for cruising the mississippi with just the wife on a weekend get away (without over-revving) thanx alot