Joe,
Hi. I'm a new guy too, but have read the tire/rim info that the guys here have left, so I'm sure someone will help you out. I am also lucky enough to have an 80-something-year-old gentleman as a source of info on these old Chevy trucks. He is a friend of my dad's, and used to drive almost every truck made! His advice on all these old rims on the larger trucks was to have a professional tire shop work on them. He also said that when he used to change tires, he would wrap the tire with snow chains while working. Good luck and have fun. This site is a great source of info.
