x2 here. Have a 71 Swinger. On the rear I installed some Moser axles with large bolt pattern. The front...new Wilwoods, so no problems. Although I did redrill my original drums, have had no issues. If you clock the drums so that the new pattern is in between the old, there is plenty of meat there. The rub is that the old drums probably are a little weak from fatigue after a lot of years. Eventually I am going to discs on the back.
