widest tire with spring relocation

well i forgot to mention i do have mini tubs with a full backseat , but for the 73 we had to alter the wheel base to make a 275 fit in the front and do the full 3" under the frame relocation kit on it . and if you want to go any wider plan on back halving it because it right at the frame on the inside . has not to jump track has anyone used the quarter lip roller from eastwood that hooks to the axle when working with these inner wheel wells ??? thanks ed