Instead of lifting the head with the pry bar, try to 'unscrew' the whole head using a long extension on your prybar. If it just that one bolt. it will either unscrew out of the block, or snap off. In other words, twist the head instead of lifting.
If pistons and crank are still in, I would attach a starter/flexplate and try to pop it off with spark plugs in on that side only.
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