Sounds like this is a philosophical issue now.
I am a sledgehammer guy too. But for you it could be different.
An engine redo can mean drinking canned beer for a few months and taxing the patience of a loving spouse.
I'm sure you will find lots of things wrong inside your a-4 if you take it apart. Then you will not regret pulling it, but it will surely cost more than expected.
I thought about your valve-sticking issue; the springs may be broken or just whimped out. A new set will put more bounce in your step. This is just one of many things a teardown will reveal and get set right.
Just cleaning the goo from the oil pan will make you feel good too.
If you take it out of the boat, plan on running the (fixed)engine for a bit to tune it up before it goes back in. Much easier in the shop than in the boat.
Russ
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Whiskeyjack a '68 Columbia 36 rebuilt A-4 with 2:1
"Since when is napping doing nothing?"
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