First, driftwood - unfortunately nothing fitting your requirements available from my sources, sorry.

Second, Mike - about five years ago we converted from a 77 OMC to mercruiser with a 3.0 liter chev. Total cost was about $6500. The fiberglass work was done by a local backyard guy that the mechanic knew, bad choice as just last Aug we had the entire transom replaced. His "patch job" went bad and dry rot set in. $3000 later we're back on the water. Case in point, have a reputable company do the glass/structural work.