Ric-
There is another A4 owner and he's stationed in Kaneohe as well...
SubtoSail
HERE is a thread about his boat. Might want to give it a read.
His story may ring familiar... He too was ready to give up on the engine.
You could try PM'ing him and he might be interested.
Or, he might be a willing partner to help you out.
I have his phone number but without his permission, I'm reluctant to give it out.