[(CIDxMax RPM)/3456] x [(Boost/14.7)+1]=CFM Required
That formula?
Didn't you say you had two 1090s? 1090 x 2 = 2180?
As long as you keep it at or below 7300 @ 15 PSI you won't starve it for air. Thats the point at which those carbs become your power restrictor.