To replace the dashpot, best to have distributor out, two screws and fit end into advance plate. It has been 35+ years since I have done that, not sure.
If you count the teeth, the total is 720 degrees at crank. Just checked, 13 teeth, so about 55 degrees, that is a bit much.
Working on a \6 distributor out is best for setting points and other adjustments. Before pulling index engine note rotor position, mark distributor.... But is your case since it is off, start from scratch follow manual and make it correct.
