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The compression results are really quite even, I wouldn't worry about the rings at this point unless you were going to do a full rebuild. Based on the carbon build up, I agree dollars to donuts that its valve seals and or a broken valve spring. I would replace the rods bearings, clean the piston tops and avoid disturbing the bores too much. Assemble with a rebuilt head and you could probably run it successfully until you wanted to pull it completely and rebuild properly. Having new rings (even just oil control) seat on worn bores is not always 100%.
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