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Thanks for your interest, JRP.

The engine is mounted directly to the transom.
Mounting height is 3 holes up, that is, in the 4th of 5 holes total. With 3" (4 x 3/4") of possible vertical travel, the engine bracket is 2 1/4" above the top of transom. I have not measured the anti-vent plate above keel difference.

I purchased this boat from Callao, VA back in 2005.