Complete rally dash frame removal

Unless you're going to restore the heater box, I don't know if I'd go to the trouble to pull it out. Once you loosen the lower bolts down behind the kick panels, just remove the bolts that are hiding under the windshield gasket and the dash frame will rock back enough to clear the heater box. You might be some grunting and cussing ahead if you just unplug and completely remove the steering column first. Getting the entire dash frame out and back in by yourself is do-able but will be easier with the column safely out of the way. One thing I started doing a long time ago after chasing electrical problems for days after a newly painted dash install, was to remove the paint or powder coat to the metal on the surface of the lower bolts, on the door jamb side. Remove enough from the door jamb area so that it is still hidden behind the dash frame, but naked enough to make a good ground connection between the door jamb and dash frame. I put electrical silicone grease between the 2 parts. Sounds extreme, but it will provide a good ground to the entire dash frame and keep your windshield wipers from coming on when you turn on a turn signal....lol. It's been a long time since I fooled with an A body windshield, but I don't think you will need butyl tape. The bedding and glazing compound should do all you need to do. I'd run that by the glass guy beforehand though, just to be sure. Good luck with it, and don't hurt your back duck walking thru the car to get the dash frames in/out!