tcodi- carbs allow us much more room for screwing up, as well as fine tunning the engine. From your post you seem to be hunting for the "magic" carb that will turn your motor into the beast you want it to be. Not going to happen. There are MANY aspect's of tunning in a engine that have to be in sync to get it to perform correctly- timing, cam spec's, CR's, ect. that will allow you to get a proper tune on your carb.
Carb. size by cfm's, for a starting point, I use this formula : CFM's = Total cubic inches x max. RPM rated by the cam spec.'s, divided 3456.
This will give you a starting point for carb. size to work with.
Every carb manufactuer out there prints a manual on proper tunning and adjustments for their carbs. They all try different things to make their's the best so find the book on the make and size covered for your carb. This is the best way to carb heaven.
Good Luck,