Re: "It ran well when I parked it!"
I'm kinda surprised that it won't free up. With soaking the heck out of it from the top [ thru the plug hole] and at the guide, then prying straight down or as Tom suggests tapping down on vise grips.
It seems unlikely but I wonder if somehow something got stuck between the face and seat and bent the valve.
Again, if it does free-up, roll the engine over a few times to make sure it stays free before putting it back together. It may take a few more squirts to keep it free.
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