This thread has bothered me for some time now and I really think it needs to be corrected. There are still a few people out there that want to restore their cars as correctly as possible and some of them come to this website looking for information and they believe what they read. Because of that we need to get this straight. Those drain holes were there to allow the chemicals that were used to wash the mill oils, weld flashing, grinding debris etc. out of the body prior to a hot iron phosphate that helped the primer to adhear being applied. The bodies were hung from chains and run through booths where they were deluged from all directions with powerful solvents and finally rinsed with high pressure water. All of this fluid exited through those drain holes. They were rinsed with de-ionzed water and sent to an oven to be dryed, the next step was the primer booth where the bodies were SPRAYED. They were NOT dipped or bathed, they were sprayed. If you question this look up under the dash and you will find nothing but surface rust, perhaps some small amounts of overspray but no primer or paint. There was a large hole in the center of the dash on the 61 & 62 models so forget the air bubble theory. If this isn't enough look under the rear package tray, again there is nothing but surface rust, and again, the package trays had several large holes so no air bubbles here either. Look inside the rockers, cut the rockers open if they need to be replaced and as the photos of Bob's car prove ,there is nothing but surface rust, no primer, no paint. I hope I did not step on any toes but this needed to be said for those who care. In later years they may have changed to dipping the bodies but not during the 58-64 time frame.