Looks like they are answering most of your questions now but yeah when you get exhaust if you have the money then get headers while your at it. Best thing to do if you have money and want more power is get a good Edelbrock or some kind of carb, new intake manifold, headers and exhaust. That will help with more power. But on your problem side I think you need to check everything that the recent people posted first before anyone can tell you anymore.