Pick up two packages of the HELP! brand replacement pins and bushings from AutoZone or O'Riley auto parts. HELP! PN. 38381 Each package contains pins and bushings for one door (upper and lower). There will also be an extra set of pins that will work to replace the trunk hinge pins on 64-66 Barracudas with a little bit of careful drilling.
Replace them with the '66+ style, it's a bolt on and they are easily rebuilt by a member on this site. (Thats me btw) Don't ruin your hinge with the crappy Help bushings. (besides that only fixes half the problem)