Hoping that what you were separating was the vinyl fabric from the polyester padding under it, rather than the fabric backing of the vinyl itself.
ONE thing to remember is that in some cases, quality control was not as good as it might have been, or Ford's or GM's was. That's just the way things were back then. I know we all want things "perfect", but trying to make some of those earlier things "better" now, 50 years later, might not be possible with what we have to work with.
Sometimes, you can play with things and make small changes and improvements, which always make you feel good, but if it doesn't make much of a difference, that's all you can do. But it can be those "little victories" that really make you feel good! Whether it's working all afternoon to try to get a door to better fit the body, molding some strip caulk about gaps in the A-pillar area's chrome, adding a turn or two to the preload on the kickdown linkage for better performance on less throttle, or some lube on the door hinges. Each one by itself is good, but put them all together and things just operate better because of these little things.
One thing to not forget . . . you can't make a Chrysler act like a Ford or GM vehicle, in many respects, due to the way they were designed. Chryslers were done to a higher level of execution, which is what got them in trouble in some areas. Ford and GM had more success with quietness and such, but a Uni-Body had a different type of quiet in it. Everybody had their own way of doing things back then, which is what made cars so interesting back then, to me.
CBODY67