Harrydale,
I'm in St. Louis. You can buy tires at Froesel tire on Manchester Road (in Brentwood, I think), but they won't be american made, and they won't look like the old tires. The Highway treads are ok looking, but the snow and muds just don't look like the originals, sadly.
As for wheels, nobody that I know of or have ever heard of offers new wheels for these trucks. You're probably stuck with getting the old ones blasted and painted, then finding someone to mount the new tires on the old rims, which is difficult at best. Easier in rural areas.
Let me know if I can be of more help - if you're close, I'd love to see your truck!
-Michael
St. Louis