When fixing up the '92 ECLB I noticed it had previously suffered a crash bad enough to dent the firewall and break the HVAC box near the fresh air flap. It was that point I understood why it had boneyard marks on the UCA; crash must've gone over the frame rail and took out everything above it. Frame showed no damage or repair.
Knowing I'd need to replace the box, had to deal with the firewall first.
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I don't think I would have ever considered going to the effort of replacing it.. but a sledgehammer from inside got it flat enough to work again.
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And once you start putting pieces back, it doesn't even look half terrible.
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Looking back on the pics I think now (and I also did then) wow, this is an opportunity to really clean up the firewall and paint it so it looks nice. Then I also thought, it's a 200K+ mile beater I'm rebuilding on a serious budget, and it's below freezing temps in the borrowed shop I was working in. Nah. Get it done - quickly.
Richard