The MSD 8383 comes with their heaviest advance springs installed . In their kit they provide 2 other spring sets and two other bushings. According to their charts, for my appliction, getting to about 34 degrees advance at 2,400 RPM I'll need to use their lightest springs and their smallest (red) bushing. Changing the springs is a snap. Changing the bushing on the underside of the advance plate would be nearly impossible with the distributor in the motor. I think you can probably do it turning the distributor upside down, but with my stubby fingers I can't even touch the nut that holds the bushing. Anyone done this that can give some tips?

  Ron Lane,  Meridian, ID