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Mine ran rough so I rebuilt the carb, changed plugs and plug wires and swapped out the distributor for a new electronic one. It all helped but it still ran rough. I was listening to it run one day...

If this is the correct replacement, it looks like a standard bolt to me.

https://www.kaiserwillys.com/cylinder-head-to-block-bolt-2-fits-50-71-jeep-willys-with-4-134-f-engine

But they also...

Thanks for the pictures. I think you are lucky it was just a small piece instead of the whole thing. That piece probably went out the tailpipe when it let go but I would have a good look at the...

Pulling the head should reveal the problem. Please post a picture of what you find.

Check compression. If you are losing to and igniting fuel in the exhaust system, then that valve may be gone. I would recommend a differential compression test so the leak can be traced if there is...