[Dick M]

I would check the ball connector arms on the bottom of the spark advance/throttle rods. They may have been switched when last installed. That would cause them to be in an incorrect position. It would also cause you to have an improper length of travel in the distributor body slot, i.e., the advance arm on the distributer upper plate will not touch the distributor body slot when in the fully retarded position. You can rotate the steering column to make compensate for it if you have a 30-31 A.