Small hole in head at bottom of valve cover bolt!

JG1966 said

Thanks Mike. I repaired a tiny pinhole leak on the bottom of a gas tank with JB Weld once and it never leaked again. I'm very confident it would hold up, but I'm gonna explore my options. I'm in no hurry. I'm not getting motor back for at least a month

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No problem, I think it would have worked also, but again there is more than one way to skin a cat.
There will be many good recommendations, some easy, some quick and some more involved. Pick your poison.
I agree with Dana7 & deburring it with a dremel or a carbide bit. I would measure the length of the hole and figure out how long of a plug you would need and either cut the end of a stainless bolt to length put a notch in it for a small screw driver to set it and JBW the threads.
Best of luck!