Correction, they WERE shot at one time. The repaired sections are flat steel, cut+bent to fit. I'm guessing the PO had never heard of ART when he patched it up...20 YEARS AGO! Any rust under there is SURFACE only. If time was on my side, I would've wire-wheeled it all and painted it. Of course, then everyone would wonder what the fresh paint was hiding![-X Damned if I do,damned if I don't.
As for 5K to fix it right, glad I don't live in your neck of the woods. That's highway robbery!
BTW, I love the 63 you've got for sale! No hard feelings,OK?