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Have you done a thumb compression check? Seems unlikely to be the problem, but it's a quick and easy verification.
Any water in the oil? From the manifold or from the no-start cranking. Doesn't seem likely for it to run if the exhaust elbow is full of water, or if there's any in the cylinders. At least there's a way out from that problem though.
Just some ideas that I don't think have been mentioned yet.
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