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That is a little low general rule of thumb for outboards is 100 PSI and within 10% between cylinders.It is good that they are even.If its been sitting a spell it might be low.You could squirt a little oil in the cylinder and see what you get.Spin it till the gauge stops going up.
i agree, a good compression is about 100 psi and a great one 120psi, 80psi is ok for such a old motor, and after a rebuild should you decide to do one, would make that motor as good as new ......
