Wheel and lowering question

[racer57]

I hope this is the right place for this. My truck has 8" rallys with 275-60-15s all the way around. It's supposed to be stock height but doesn't look it to me. Anyway, I'm wanting to put 15x10 rallys with a 4.5" backspace on the rear and a 4-6 drop. My question is what size tire combo would look good with this and would I have any problems with rubbing? Also what company would be the best for the drop kit? I want to do static drop without doing a c-notch. Any help is greatly appreciated.