Here's what I would do if I were in your position.. I would first look at how the plywood is mounted. If it's possible I'd remove it and just flip the darn thing upside down and reglue it in place... That would change your 2 degrees left thrust to 2 degree right thrust...

If that won't work, or doesn't look possible, then just cut the whole plywood mount out entirely... Make a shim out of some light ply to glue to the face of the firewall, then install some standard plastic engine mounting rails on her. Should be good to go.