Can I run these tires?

This winter I am going to be doing a mini-tub on my 72 Demon. I will be moving the springs inboard as well. I currently have American Racing Outlaw 1 wheels. They are 15x8 with 4 inch backspacing. I will be going to a 10 inch wheel with the proper back spacing to keep the outside of the tire exactly where the outside is now. I run 275-60-15 M/T Sportsman ST's. My question is, will the following tires fit in the new wheel well?
Nitto NT 555 R Tires N180-810

Mickey Thompson Sportsman Pro Tires 90000000210


Jack