If the head comes off of that motor you can try this. Mix ATF and acetone together in a 50/50 mix and fill the cylinder. Let it sit a week pull the head off and find a Hydraulic press and take your chances.
It's a decent motor. I would replace the exhaust housing gaskets on the block and the impeller. Keep it propped to 5800 rpm and go boating. Do a compression test before buying and hopefully a test run on the lake
