point/eletronic ballast?

The pertronix a friend of mine is using replaced the points, but nothing else was changed. It isn't electronic ignition, simply replaced the points. I have a dual point distributor, and looked at it, but haven't made a decision
He has a RR and told me his car ran better and actually was getting better fuel economy. Just a thought
He has the ballast resistor. Everything looks stock unless you take the distributor cap off