Welcome!
One of the many reasons I'm soon to be purchasing a TIG is a 72 GMC project I'm working on. Floor repairs, cab corners, rocker boxes, etc. as well as a ton of custom body modifications. I've done it with a MIG before on other vehicles, but I'd prefer to wait a bit and use the TIG rather than spend the extra time fixing the aforementioned warping and other MIG artifacts.
The nice thing though, on the older cars and trucks, it's nice heavy steel, not like trying to cut a beer can in half and weld it back together like these new cars.
Trip Bauer
Former USN HT
Everlast 200DX New Model
Hobart Handler 125 MIG
Van Norman #12
Atlas 12" engine lathe
'98 RoadKing - 84 Ironhead - 59 Ironhead