Andy,
Congratulations on what appears to be a successful operation!
Your engine will have a good chance of working out of the sticky valve syndrome permanently with continued use of Marvel Mystery Oil (MMO). I recommend doubling the recommended dosage on the can (4 ounces per 10 gallons) to at least 8 to 10 ounces per 10 gallons of fuel. I'd also give the engine a few MMO treatments by applying 5 or 6 squirts of MMO into each cylinder (maybe just before taking the boat out for the next three times).
Regards,
Don
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