Is the crank still in the engine? If it is use a pick to get under an edge and try to stretch it a little at a time working across being careful not to gouge the crank. If its out of the engine hit it with a propane torch and slide it off.
Thanks much. Turns out it was not sleeved prior. Engine still in the car.
I got the sleeve and new rear main crank seal installed and everything back together and all seems well. Car runs good and no leaks so far.
Used a timken sleeve and timken rear main seal.
Big project, replaced lower intake manifold gaskets at the same time, all new exhaust front to rear, new plugs, wires, cap, rotor, new motorcraft fuel pressure regulator, clutch components, steel transmission input shaft bearing retainer, throwout and pilot bearings, release fork and pivot stud, amongst other things..