I second the advice above. Mine sat for 50 years so I put tranny fluid in the cylinders and let it sit a couple months while
I worked on other stuff. Used a small pry bar between the bell housing and flywheel teeth . Moved it a little bit, added
more tranny fluid, let it sit a few more days then moved it back and forth a little more each time.
Engine runs perfectly now so there is hope for you. Just don't force it-something's bound to break.
