Appropriate prop

[Jason1213]

I have a '98 Bayliner Ski Challenger boat w/a Mercruiser 350 magnum tournament ski engine that I need a prop for. Is this enough information to order one? The current prop is stuck on the shaft and I can't make out the part number. It looks like an OJohnson prop that has the following marked on it: 3 97 OJ 13 12 Cup 18. Does this make sense?

 

[Starcraft5834]

why is the current prop "stuck on the shaft"? the numbers above likely mean pitch is 18...what performance numbers are you getting now with that prop? gps speed, engine at WOT? (wide open throttle)... you need to provide this information before any useful suggestions can be offered