Its always good to go to other forums and see what other people do so as not get caught up up in the "Echo chamber" that is FABO.
Here's an interesting post over @ SpeedTalk.
Raising the port roof on a head worth it or not - Don Terrill’s Speed-Talk
The Moroso slide rule shows 480 HP to run 10.90's. So with that Airflow its making 2.23 HP per cfm.........talk about efficient.
Guess you don't need all that Airflow if you can figure out how to "utilize" what you already get.