Quick update. late last fall, I got the title for the GMC that turned out to be a 53. The other one by vin was verified as a 49. Today I started tearing into the 53. All in all it has less than average rust and dents ( except for the passenger side rear quarter panel. The 49 has cancerous rust everywhere except the ps rear quarter. Including the visor area where a rat built a nest.
Today on the 53 I got all the side windows out and all the doors off in preparation for the dent and rust repair. We got a lot done today. Next time I will be tearing into the 49 so that we can remove the needed parts including the rear quarter panel and the clamshells and get them ready to install on the 53.