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As in racing the prop makes a big difference. However the choice of props for your engine is limited as most of the lower HP engines are. The OMC prop is 8 x 7 1/4 2 blade weedless with no other options. There are some Michigan made props but all are out of stock. They offered: AM 430 7 3/4 x 6 1/2 BR 3 blade, AM 431 7 3/4 x 6 1/2 Al 3 bld, AM 433 7 3/4 x 7 BR 3 bld, J300 8 x 7 1/2 AL 2 bld standard replacement and JWC 5 7 3/4 x 6 1/2 AL 3 bld weedless. Whtch your swap meets to find.
Weedless means the swept back blade design is suppose to let weeds fall off the prop. Like Frank says doesn’t alwalys work. Your transom height makes a difference between boats. Not all of the smaller boats actually have a 15" transom. Measure and get shim sticks to adjust higher.