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Thanks all. I looked at the engine mounting bolts, and the engine is mounted low (top mounting hole used) and the bottom bolts are through the engine well and bolted into the bracket somehow, not through the bracket slots. The heads of the lower bolts are in the engine well and look like they go into a part of the bracket just above and outboard of the lower slots. So raising the engine may be more involved than I thought. I may just live with pumping out the engine well by hand and leave it as is. Thanks for the input.

Eric