Usually these old motors have gas & have fire they'll run. If it has a bad miss may have a bad plug wire or fire jumping somewhere. Crank it in the dark & see if you see fire jumping.
As far as the lean/rich knob tighten then back out 1 1/2 turns & start from there.
As far as the leak that could be your miss also. If it's getting water in the heads it will crack the head or a piston. that needs to be fixed!
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