I have a 1989 VIP Vision with a 2.3L ford and an OMC cobra Drive. I would like to know what the recommended W.O.T RPM is for this engine? I'm looking to buy a new Prop. It came with an OMC 13-3/4" X 15 and I also have a Michigan 13-1/4 x 17. Is there a better choice?<br /><br />Thanks.<br /><br />Brad