Run a combo not too far off and found that the MSD box with Blaster coil really helped to clean it up. Everything else has a compromise such as bigger carb is more power less milage, bigger cam is higher rpm to get to usable range. Beter ignition is win/win better per Dr Jacobs. Starting,running,milage and cleaner burn. I also had a problem with an incorrect ballast resistor on a coil-distributor that took some life out of me before we found it. One system at a time works for me.