I built a 2 x 4 mini stud wall and snugged it up under the door. Then I cut the door pins with a dremel tool and pulled the doors off. I have power windows and door locks so I had to fish the wiring out of the doors first.
Use GM OEM door hinge pins and bushings. They are still available online and from Chevy dealers.
Scroll down to post #15 and later to get part numbers and R&R method:
http://67-72chevytrucks.com/vboard/s...ight=tucsonjwt