[MrMagoo]

My full mechanical MSD was curved by Keith Craft. I believe he installed the light blue and light silver springs. The curve starts early (around 1700) and the advance comes all in at 3000. Of course the curve is dependent on the specifics of your motor. You might want to get the car on a dyno to experiment to find the optimal setup.

Keith was pretty adamant about making sure that I check the total advance, more so than the initial advance. If your total advance is right, you are checking two things: the advance mechanism advances, and it stops advancing at the right place. Basically, you just open the throttle while you are looking at the timing mark with your light.

My initial advance is 10 deg, and has the 25 deg (silver) stop bushing installed for a total of 35 degrees.

Just be your usual careful self when you change the springs and bushings, and make sure you check the timing with the motor reved up and you should be good to go.