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5psi difference is nothing to really worry about. All cylinders should be within 15% of each other was the standard at one time.
If you think the psi seems low, try a different gauge. Yours might read low while the others you saw might read a little high.
Just do the DOD delete with new lifters, have the heads cleaned up, valve job and mild porting maybe. Inspect the cylinder bores while it's apart, if all good send it.
Then save up for a nice 427 short block swap later.
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