Re: stuck 8BA
Before you tackle that main oil gallery pipe, I'd strip it down and make sure it's good first. If it all checks out, then it would be worth replacing that pipe.
As others have mentioned, it sounds like the red wrench is going to be friend here. Torch it all out and go from there.
Sometimes too much force causes damage. I've read a few times of guys cracking cylinders by driving stuck pistons out of the bore using too much force.
Soak, soak, soak for as long as you can before taking this engine apart.
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