Given that you haven't fixed on a final setup (or at least it appears you have some uncertainty remaining to resolve) I would suggest you try one of the online calculators, such as XCalc. If you cannot solve your problem using that, check back here and I can try to help.
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Given that you haven't fixed on a final setup (or at least it appears you have some uncertainty remaining to resolve) I would suggest you try one of the online calculators, such as XCalc. If you cannot solve your problem using that, check back here and I can try to help.
It will depend on the load applied to the motor and the RPM you want to run it at... what prop is it turning...
As if there is no one knows how to do this on this site...