Freezerburn:
Welcome! You are in great company here. I am former Alaskan, spent '75 - '84 up there. I am now living in Portland, OR and have a '46 6400 myself. I just have stock wheels and can't offer you much insight on that score. There is TREMENDOUS
info within this site. I did find a very helpful source of original GM information on the web, FREE, at:gmheritagecenter.com I was able to find .pdf files on all original
build equipment, dimensions, and drawings for my truck and they will have yours.
It is very great to have this stuff straight from the horses mouths. If you are concerned about split rims, etc., there is a complete discussion of that issue with
all the detail you'll need right in this site. A good reason to dig around. I would like to encourage you to take pics of your truck and submit them to the Gallery with a brief story of who, what, when, where, and why. Check out what other guys have written to get an idea. If you need any help doing that just ask me.
Best of luck. I am on the west coast if you need some part and I can help you
get it shipped I am more than happy to be asked. I travel a great deal so I am
often not home. Take care, and stay warm Mark aka LevisPop