IF the other cyl have stuck intake valves, they will blow back into the intake and stop the one cyl from getting fuel in many cases.
The cyl with zero compression, may simply have a valve stuck open, and the other low cyls could be leaky valves..
I would work the head over first and get all the valves loose, operating correctly and even lap the surfaces to knock off any rust so they seat correctly...
But I would also think hard about pulling the pan if it can be done with out splitting, and pop out the pistons, clean the ring lands and re-ring it... and new rod bearings.
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