89 Scarab 22
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350 mag WOT engine rpm per mercruiser is 4400-4800. You're in the ballpark with diameter. Odds are your money would go further talking to Greg at Cutting Edge Propellers about getting your existing prop woked/labbed. FWIW, a laser 2 21p on my 94 22 Scarab with a 350mag/alpha setup has pulled a best of 60.9 with two people in the boat, half a tank of fuel, and 75* air temps.