I want to get rid of the 33x12.50's on my '79 Power Wagon. They are too big for my taste. The rims on the truck are 10" and I plan to replace them in the future, but would like to replace tires immediately. Can I safely run 255/70/15's?

Edit: whats the narrowest tire on 10" rim? I'm looking to get somewhere around what would've come stock as I prefer that appearance, and from what I have found now it would probably be 235/75R15. I'm doubting I can keep my 10" rims but please any tire experts, advise me.

Thank you.