Its alway going to draw only what it can. 2 750's dont equal 1500 CFM draw because the drop in vacuum they create when they open. Read Vizard's "super tuning" book.
Ding ding ding! Wait till you see my tunnel ram setup blow everybody's mind! It can't make power below 5k rpm! It can't run on the street! It's gonna cough and sputter and puke! Hahahaha I can't freaking wait!