I ain't got no idea what the correct compression should be but I'd tend to believe 90psi and above should be good. And hope for less than 10% difference between the cylinders.
Have you tried to reposition the engine up a hole or two?
I'm guessing about 3/4" above the bottom of the boat (cavitation plate) should be close.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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