[tubman]

Is there a pointer in the timing cover? There should be and you use it in conjunction with the dot on the pulley to time the engine. On a stock engine, they should line up when the timing light flashes. The vacuum advance (if any) should be disconnected and plugged. (I usually use a vacuum gauge to set the timing; advance the timing until the vacuum is at a maximum at idle, then back it off just a bit.)

If the pointer is missing, you can make one from a proper-sized bolt. Be careful when inserting it, as some timing covers have two holes, one for cars (marked 8BA) and one for trucks (marked 8RT).