I am getting ready to purchase Coker 600x16 radials for my '36 Ford, I will be using tubes from Coker in the tires because I don't think the stock Ford wide five wheels will work well with tubeless tires.
A lot of people think that radial tires on a stock 36 wheel is not a good idea, I disagree. The one problem that most people overlook with radial tires is that they are high pressure tires.. Probably in the 32/34 psi range, anything under 32 psi will cause poor handling..
I have P215/65R15 tires on 15 x 7 wheels on my '39 Conv. The car drives and handles perfectly.