It cannot be said enough that the breaker plates need to be pulled apart and cleaned occasionally, every 30 years or so. I pulled my dizzy on the 69 and the vacuum advance (with the dashpot disconnected) had a significant amount of resistance. With it off the car and the screws removed, pry the plate out and work carefully. Remove the ball and the spring held on by a screw. Note the brazed ground wire, do not allow it to break. There is likely a significant build up of old lube, now gluebe, between the upper and lower plates. Spray in carb cleaner and as they loosen up look to see how to separate them. Watch the wire! Clean this all up, and reassemble with a dry moly lube on the clean metal contact areas. Experience proper operation with functional pieces before pursuit of so-called upgrades. My acceleration went from sluggish to incredible.