Rusted up wheels, what to do?

[cleanshaven84]

Hey guys, I have a set of orginal wheels that came off my '49 that I was going to throw some old tires on just so I can move it around. I took the old tires and tubes off the truck and found that two of the wheels are rusted out around where the valves stem goes. I had plan on not using a tube and just putting some new valve stems in. Would it be possible to still use tubes? And would it be a problem to run tubes inside a supposed "tubeless" tire? And what is the bolt pattern on these older trucks? Is there another rim I could possibly use? I've heard that later model 6 lug Toyota's have the same lug pattern. Is this true? Thanks for any help.

Here's a close up of one of the rims.