OK I was thinking more about this as I had my bbqed brisket and beer. It's rather difficult to determine what one needs for a carb, as every engine, other than a bone stock one, is different in the way it breathes. My heads flow a certain cfm but they have relatively small ports, they get the flow by high velocity, a large port head may flow the same cfm at a lower velocity. Big hole low velocity small hole high velocity, for the same flow. I don't pretend to know much about the different flow characteristics of all the available carbs on the market as it relates to air speed. One can only go by what one has experienced, I know what works for my engine but others who have dealt with more engine combos than I, may have a completely different thought on what cfm is needed in a carb. Just my thoughts, I'm not an expert.
