That's a nice truck! With a good wash and a little TLC it'll look 100 times better. I dig the direction you're going with it.
Once the leaf springs are moved in and the wheel houses are widened there will approx 16.5" from frame to inside fender lip. That will accommodate quite a tire. I'm hoping for a section width of 15" tire like a Hoosier 29x 15.5 x15 or the next narrower size down will look great too.
