Welcome aboard
I would use Mercruisers prop calculator to see what it recommends.
More blades equates to a better bite in the water however that also means less slippage for a holeshot so the engine will be slower to rev. A 4.3 should have enough torque but you will need to pick a prop with the right pitch and diameter to not overload the engine.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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