Timing Light

Are there any special things to watch for when using a timing light on a carbureted 911? I havent used one in so long I think I may have forgotten. Would someone mind going over it for me. Thanks.

Basics are:
-Red clip on + (positive) side of battery
-Black clip on body ground (- negative)
-Big square (or whatever kind you have on your light) sensor clip goes around #1 spark plug wire

... start engine
-loosen distributor clamp hold down bolt (just enough to be able to move it by hand but not enough that the engine will move it by itself
-aim the light at the fan belt pulley while running the engine
-turn the distributor slowly until the vacuum advance mark lines up with marker on the engine block (sorry, can't remember what this looks like)
-when lined up as you want it tighten the distributor clamp hold down bolt


... go enjoy driving that beauty until exhaustion sets in
... have a beer

[This message has been edited by tog (edited 11-14-2000).]