John,
Cool truck and an even better history. Best of luck with your project. I certainly hope you better success than your various uncles!
The insulation your are seeing up around the windshield hinges behind the header panel is most likely the seat padding. Mice think that area is the most wonderful location for a penthouse condominium complete with bathroom facilities. Much of the corrosion up there is from their urine. Unfortunately GM body design engineers made it possible for vermin to gain unimpeded access the header panel via the a-pillar. Worse yet, the rodents can get into the header panel area in a completely tight and assembled cab. When you get the floor and toe boards out look at the front cab mount area and you we see what I am talking about. When I restored my truck, I focused on all original, but this was one rare exception. I formed a couple of barriers to keep those little buggers out.
Good luck!
Paul
Last edited by Peggy M; 10/24/2023 4:51 PM.
