If you want to battle headwinds and seas I would use more than the 20 HP engine. Depending on your budget and space the 25 or 30 would both be good choices. The 34 I used to sail on had a 2 cylinder Yanmar that was 18 HP (I think) and shook the entire boat. It was by no means overpowered. 3 cylinders = less vibration and more power.
Joe Coquina C&C 35 MK I 4 cylinders
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