Oh, and I should mention that rotating the distributor clockwise will retard the ignition timing (rpms will slow down), and rotating counterclockwise will advance the timing (rpms will increase). If you end up having to advance the timing a lot, the rpms will possibly increase above 1100-1200 rpms, and then you will have to re-set the idle speed, and recheck the timing again. If the idle is above 1200 or so, the mechanical advance will start to come into effect, and your timing settings will not be accurate.
Good luck,
Bob