Farmall Super C with stuck engine

I have a Super C with a stuck engine. Any good advice on how to free it without tearing the engine apart?

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I’ve squirted PB blaster in the spark plug holes. Put the crank in and put a little tension on it with a jack and leave it for a few weeks. I’ve had them come free that way before, but only if they aren’t stuck hard. Usually they need tore down.