MP Distributor Tuning Tutorial
The mechanism in the MP distributor is made by Mallory and Mallory sells a kit for setting up the distributor #29014 available from Summit or Jegs.
It has spacers in 2 degree increments for setting the stops and a selection of springs with the advance cure the springs and combination of springs produce. Will take that 1.5 hours down to about 15 minutes.
FYI, if you get the billet MP distributor without the vacuum advance you don't need to remove the reluctor or pickup plate.