I did mine (91 V20 350 I/O) what I did was remove the rotted wood (left the fiberglass sides) and filled the area with glass and resin, drilled and screwed the motor mounts in it with lag bolts.
So far mine is holding fine.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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