first, I think the only way to do the calculation would be to take
measurements off the hull and use one of the free hull design programs.
that's because the bouyancy depends on the underwater size and shape.
of course you could do the calculations the old fashioned way using flat
surfaces between stations. adjusting for angle of trim would be hard to
do, I imagine.

second, I don't think it will be good enough to get the water surface at
the level of the motor well when the boat is at rest. Its when the boat
comes down off a plane and the backwash hits the transom that the most
water will come aboard. That's what you have to aim for.

good luck


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