I don’t have a single part of it yet. I want to do it all together, because every part of it has to be right on the other side. But when choosing the carburetor I don’t quite know?! Can I calculate the CFM? If yes, how? Do I need to know the final performance that I want to give my engine to select the carburetor based on the size or the flow rate? Many advise me to nem Edelbrock, others to nem Holley. They say it is difficult to adjust. That makes me stubborn. help anyone to do that?? Thank you.