Unfortunately the science of engine rebuilding requires measurements taken with something more accurate than the human eye. If you don't have the tools to take a precise measurement, take the block and piston to a machine shop and have it done. This is your second tear-down and you mentioned you want to do it right. Also looking at a picture is far different than looking at the engine in person. If you think you can "see" a lot more of the rings while looking down on the piston crown, it probably is worn, but to know for sure it needs to be measured with a bore micrometer.
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149, 2072, Original, 1772, 1782, #1 cart, Parker 48" sweeper,
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