I agree with Pete on rocking the crankshaft over hitting the top of the pistons. I would tap the pistons lightly to help loosen them up. I also used my Stanley flat bar on the flywheel teeth and bottom of the bell housing to rock the engine back and forth.
It sounds like it is moving a little. That is a good sign. Keep doing what you are doing. Work on the other stuff to keep from getting frustrated. But go over and rock the engine while you are there.
Don't forget the pins where the rods and pistons join. I found a couple of mine frozen/sticky.
I hope this helps. It sounds encouraging.
