Far be it from me to suggest that all stuck engines can be freed up, but if you get it to begrudgingly turn with a long pry bar on the flywheel teeth, you only need one third of a rotation to get the pressure plate off and get to the flywheel to take it and the bellhousing off so that you can remove the crank and work on freeing up the pistons one at a time with the crank out of the way.
