One or two cylinders could be worse than the others because at any point in the engine rotation at least a couple intake and exhaust valves are open. Those cylinders that were open to the atmosphere for 13 years will get rust on the cylinder walls from condensation, etc which causes pits and a poor ring seal - possibly your oil burning problem with #4.
Valve seals drying out will cause oil consumption, but if the oil seals are dried out your rear main seal, front main seal, gaskets, etc probably are too. 13 years is a long, long time for an engine to sit - that is why I agree with your plan to pull the engine and go through it. 400's are getting hard to find and can only be rebuilt a couple times so IMO it would be a good idea to go through your gem and make sure it is right.
Just my opinion.
E85 racer and E85 carb builder
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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle