I couldn't get a 275 60 under my 65 Valiant without the 1/2 relocating kit. Once I did that though, I could fit 28/9/15s on 15x9 Center Lines. That was with the stock tubs. I agree 100% though. It's kinda senseless not to tub one when you move the springs inboard. If I was doing more of a "drag themed" car, I'd move the springs inboard on Vixen.