[Pete Wolff]

The proper dwell for your dual point would be 26 degrees each and 34 degrees total. I used to block the points one set at a time with a match book cover and adjust to the 26 degrees while cranking the motor.
Do yourself a favor and convert to a Pertronix module. No modification necessary to the dist and the car will start/run better. Conversion bact to points if needed in an emergency is simple