My advice would be find an insert that has threads on the outside, make some kind of temporary mold with milk cartons and duct tape( milk cartons because the inside is already waxed) Take the insert and melt some wax into the bottom of it to close up the bottom threads,make a small bracket that will fit around the insert about halfway down the threads and into the hollow space to the right of the insert, goop up the hollow section with epoxy -cabosil mixture and put the insert-bracket in there, cover the rest of the bracket with the epoxy and fill in the mold with the epoxy mixture, before this sets take the engine mount and put the bolt in the good hole , then lightly thread a bolt into the insert so you can assure they will line up when finished, let this mess dry then sand and shape it.
