I was going to go with Pertronix but called the local speed shop today and they said go with MSD. The owner (which is who I deal with everytime) said that the MSD unit is 10-20 bucks more than the pertronix and he likes it better. Which to me looked the same and had same functions. Plus the shop has MSD logo on their shirts, etc and they race so I think it's a sponsor that is why. I just went with the MSD instead.