Dual carb cfm requirement

Hey all, thinking about building a new engine for kids mud drag truck. Currently have 557 with tfs 325 heads and mafia intake. Son wants to go bigger so he bought a svo a460 block. And getting ready to buy new A460 heads and intake from TEA. We are going tunnel ram and dual dominators. Engine will be 572/598 cubes. This is probably a stupid question but, how do u figure carb cfm needed for twin carbs. Can't seem to find info on this anywhere. Thanks cory