For old school Foutain owners prop size.
 

Probably some threads here however in a rush as always. Some help from real world experience 12 meter owners only. I have an 84 12 meter rather stripped down in the cabin with modern cockpit seating, panels etc. Bottom trued.

Propping for repower and and RPM. Boat has SM3 19 spline shafts close 3 1/2" below surface. Engines 565 short deck apprx 750 hp at 6,300. C72 1.52 trans.

Would like to prop for 6,300 + or - to get in the ball park. My current 3 blades I know from previous owner are to large as they only spun 4,400 behind 468's with 250 sc's. (Apprx 600-625 hp).

Any good recommendations for a starting point.

Thanks.