Getting Weld Draglites, What offset do I need?
 

Im getting 15x3 1/2 for the front and 15x8 for the rear. Will i be able to get a 275/50/15 tire under the rear fender well with a 5 1/2 inch offset?

They should fit fine with limited hammer work. It may rub a little on the inner fender well under full suspension travel, but then again it may not.