It's impossible to tell Money... what size is the engine? How many HP?
Generally, as a starting point, I'd go with either a 17 or a 19 pitch prop... but there are so many variables.... For right now why not just use the prop that's on the outdrive and see how it works... that will be your starting off point. Then let us know what your speed was at WOT (Wide open throttle) and we can advise you further from there.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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