I have a Super A at school my students are working on that I was SURE we could break loose, put some fresh gas in, and make it run. It looks like it blew a head gasket and the previous owners parked it with antifreeze in the cylinders. Three came out pretty easy. The #2 piston required brute force. I expect that's where you are at.
I still planned on cleaning everything up, throwing in a gasket set and putting it back together. Then this happened while we were trying to un-stick the rings.......did that, all by myself, with about 15 students watching. It was quite a day.
Al
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