Is this statement correct?

Holley rates their carbs at 1.5 inches of manifold vacuum, if the vacuum is high than that at WOT the carb will flow more than it is rated for, if it's lower than that it will flow less than what it is rated at. The main thing you want is the least restriction possible as that will create the most HP.

If we go to wallace calcs and use their...... http://www.wallaceracing.com/carb-cfm-vacuum.php for our carb which is a 950HP, but has a different base plate only, we input our parameters and the 2.0vac@6000 from the dyno reading it suggests the carb is flowing 1097cfm, possible? So which is correct, less vacuum@WOT close to 0 for best HP or not....what do you guys say......Intake is a 440-2.