where to measure 273 ring gap in cylinder bore

GLW said

Just got it back from machine shop. It was bored to .040 and heads reworked. Compression ring end gap Measured .020 at about 1 1/2 inch down from the top, it measured .017 at 2 inches from the bottom. Is that to much taper?

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I'm not going to try to do the math to figure the circumferential difference in relation to end gap and taper at a given cylinder length- just measure the bore at top and bottom and see if it falls within spec. The number should be in the FSM. The machine shop should have given you the final dimensions after cylinder prep... Heck, it should have been matched to your pistons.