Stuck distributor gear 318la

Sounds like the shaft is stuck in the bushing. I would remove the dist and turn the engine over backwards by hand. I’ve had luck as the spiral cut gear will walk it’s way up ward as the camshaft turns backwards. If that does not work you can either pressure oil thru the oil sender unit 1/8” pipe plug or remove the intake and using a screw driver or small pry bar pop it out. Other option is remove the pan and take the oil pump off and tap the shaft from the bottom.
PB blaster as mentioned will also be a simple solution.
Keep us posted.