When I unstuck the 261 in my 57 Pontiac it took a lot of BS to get it to finally roll over. "Deep Creep" in all the cylinders, 5 days straight. Starting on the second day I put a 4 foot bar on the front damper and pushed and pulled a little to see if there was any movement. If not, more penetrant, lather, rinse, repeat. On the fifth day it moved a little.
I kept working it back and forth, but could only get it to move 355 degrees in either direction. I could not get it to roll over, and I didn't want to force anything...so I pulled the head. A little mousey had wriggled in through an open valve and left some seeds on top of #2. The seeds came up under the flat part of the head and kept the engine from rolling over. I got a good look at the cylinder walls at least and there was still a decent cross hatch and no ridge at the top.
My issue is sticky valvetrain. I really should pull and dis-assemble the head and get rid of all the sticky, gummy stuff that used to be oil and re-assemble. Same for the lifters...sticky. This has given me some wild fluctuations in compression as stuff sticks and unsticks randomly.