Don't read if you're close minded

And what about distribution? Of air & fuel? Many production engines had snivvies riveted to the side of the booster to re-direct airflow. Obviously the factories found variations in cyl-to-cyl air flow & this was a fix that was used.
Aftermarket carbs.........Well who knows. Some of the variations in HP might be from how a particular carb directs airflow...& not in it's cfm rating.