Hi Tim
I removed the hinges on my 46 cab and one door in an attempt to adjust the door fitment. What worked the best for removal was heating the clutch heads to cherry red and cooling with water, then using a manual impact driver to remove. Ranks right up there with stubborn king pin removal.
I found there was no provision to adjust the cab or door hinges and removing the hinges was really fruitless. The door adjustment was better accomplished with the hinges in place.
Unless the hinges are damaged, I think you're ahead to leave them in place. And keep your original clutch head screws.
