I've replaced the windshield and headliner on a 70 B-Body but not an A-Body. First, does the windshield have to come out to do the headliner? IIRC the material wraps around the lip on a B-Body and then the gasket goes over it. Secondly, is the A-Body windshield gasket a "zipper" type like the B-Body?
Anything that much different from an A to a B that I should be aware of, thanks.

Glass does not have to be out to install headliner but it is easier. There are gripper teeth front and rear. With the glass in you just have to tuck the headliner under the gasket.

The front and rear gaskets use a 1/4" round lockstrip.

I have pics of my headliner install (with all the glass, roof rail weatherstrip retainers, and other trim out) here (scroll down): http://70duster440.com/reassembly.html

Thank you very much.