Rusty46:
IF you can get the hinges off that may be worth trying, but those hinges are not going to be easy to remove. How far are the doors off? There is a certain amount of adjustment you can make to the alignment with the door on the cab. The 46 GMC shop manual has a pretty good explaination. (there is nothing about this in the Chevy shop manual). If you need more info on adjusting the doors per the GMC manual let me know.

Good Luck
George