I know the early Valiant is a different animal, but I had a 65 I put the MP offset hanger package on and mover the spring perches in 1/2. I was able to run 15x9.5 Centerlines on the rear with 28x9x15s and eventually moved up to 28x11.50x15s, but had to roll the lip of the outer wheelhouse. I did not modify the wheel tubs in any way. If that helps any at all. I'm unsure though, what the point would be in moving the springs into the frame rails and not doing a mini tub.
