Don't pull the head just yet. Let the PB Blaster soak in good, keep spraying it. If you can, give it several days to soak.
Try the hammer again, a small hammer, more shock than beating. If it will go down, it should come back up. Try 2 large screw drivers on each side of the spring, try to pry up, equal pressure on each side so not to bend the stem. The object is to get it to move, just a little, just enough to break it loose so more PB can get down the stem. You might get lucky and it will come loose and pop shut. If it does, keep tapping it with the hammer, pry down on it to free it up. Just be careful not to push down on the spring retainer. The keepers will fall out and the cap will come off. Not that big a deal to put it back on, just more hassle.
Once it is free, put the pushrod back in, adjust the lash, get it running and watch it to be sure it stays free. Also watch the rocker assembly to be sure it is oiling. Won't oil much, just drip, but all the rockers must show some sign of getting oil.
After it has run a while, shut it off and adjust the valve lash again.
There may be a reason it was stuck. Hopefully it was just condensation or rain. But a head gasket or cracked head can also get moisture in the cylinder. Time will tell. The strings tied to the rockers? Who knows, someone has been there, maybe marking them as they were adjusted? Who knows.
Since you are going to be working on, and finding more problem areas, a shop manual would be a very valuable investment. It will more that pay for itself in mistakes not made!
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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