You're going the right route!
Getting a basis to start makes it a lot less expensive by not buying prop after prop till you find the right diameter and pitch.
The 15x16 sounds like a good compromise. Just be cautious about over revving the engine.
See if FERM can give you the max rpm's intended for that motor.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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