The main isue with using modern radials on the original rims is that the rims are very narrow. They're actually too narrow for most modern radial. The 215/85/16 is about the only size that is close to working. I would not advise using tubes, it is illegal to install tubes in modern tubeless radial tires, as it can/will cause tire failure. On 1 peice wheels, tubes should not be required.
