Re: fair price
Looking at NADA shows all the 1988 150 models listing at $410. Then throw in the cost of the rebuild and $1200 may look like a fair price. Get some kind of warranty and don't make the mistake of letting the boat sit in the driveway the entire warranty period. I've seen people do this and then take the boat out for the first time after the warranty was expired and have a problem, sadly no coverage.
Sometimes you're the bug, and sometimes you're the windshield.
Capt Ron