Which Pertronix set up is it, Ignitor 2 or 3? Make sure your coil is compatible to the model you have. You can call them and they will verify. Sounds crazy I know, but I was there and hating life. The bad news is, I think you will need a mechanical advance Distributor. With a 3x2 setup, vacuum drops under acceleration, which is the opposite of what you need when using a vacuum advance. I fought the same crap, bought a MSD, blocked off the vacuum and the thing runs great. The new distributor with the pertronix installed is setting in a box somewhere. Maybe you will find a different way to make it work, but this was my experience. Good luck.