My guess would be they were caused from extreme over heating.
As low compression those engines are, I doubt wrong plugs or way too much timing advance would cause that, but I could be wrong.
Several factors would determine if they are usable. Once they are out look at the skirt. If it's been really hot, they are probably scuffed and seized. That may be why they won't come out... If they are, likely not usable.
Another thing to check, how thick is the top? If they are burned 1/4" deep, probably not much left. Can that be repaired? Yes, it could be ground out and welded up, but unless you have the equipment or connections, probably cost as much as replacing them.
And, what is this going to be? A working tractor or show? Do you feel lucky? LOL
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