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Check the intake manifold and see if you have any oil puddles inside it. Any air leaks around the breather gasket or hose will pull oil into the intake..and the oil may just sit on the intake valve that was closed and was the lucky one that puddled oil so you could see it.
Don't think it is a valve guide/stem seal..they wear out evenly. I doubt the re-builder missed a valve stem seal.
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