You can change that head gasket yourself. If you have a Clymer manual it will help you through it. I would have a machinist resurface the head and maybe reseat the valves and check the valve guides and springs for you. I'd try and buy new headbolts as the ones over the exhaust side can get rusted up pretty bad, and headbolts stretch when torqued down and the heat over time reduces the strength of the bolt. Always go back and retorque the headbolts after about 10 hours of run time. Its really not that hard. I've rebuilt three of these motors with great results, they're really simple engines.
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77 V20 cuddy with 170 I/O Mercruiser
72 16ft. Carolina w/a 25hp Evinrude
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