[cincygman]

Open headers make it very lean. the carb needs to be tuned for that if thats the way your going to run it. Other wise anything you do now won't work with any kind of exhaust on it. There are a lot questions to be answered. Do you have timing advancer, vacum or mechanical or both. Does the timing advance work? Does the model of carb your running use adjustable metering rods? where are they set? Engine mods? Cam? Heads? so many questions, so little time............................