I simply want do it once with the meter and timing gun. Rather than guesstimate without and have to do it over again when it gets here. When it finally arrives I will let you folks know.Agreed. Did you try closing the gap a bit, or closing it until misfire then open up 1/2 turn? Measuring dwell is the precise way to get optimum spark, and easiest way to do it with a GM dizzy; but not necessary to get a typical stock engine running OK.