292 was a torque monster. A lot of dirt racers still use them, I think.
At only 2800 dry weight, you may have enough blade area and not need the larger diameter. Figure your slippage using theoretical/actual top speed. Some say 15% slippage is desirable, but I always liked it below 10% if I could get it. It helps to do your prop trials fully loaded - or at least half-loaded. The speed you can make with a stripped boat is almost never real world and can lead to serious inefficiencies when loaded.
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