*I think* you were just reading a thread that suggested the best, easiest way was to use a spacer in between the front spring hanger and the spot on the body where the studs go through.
With the springs moved inwards, the bolt hole for the front of the spring may not be able to moved unless it is a substantial amount. Enough to create a full hole with some metal in between the old hole. Enough so it won't intrude or wear into the old hole. True, a good welder can fix anything.....
Before you center the wheel in the opening, take measurements to see if the wheels are even in distance from what ever point you choose to measure from. Like the center of the trans tailshaft or the T bar cross
Member, or ....