Idle speed control with ITBs.

In the process of setting up an ITB manifold on a small block Ford. I've toyed with the idea of DBW but cannot set up a rigid enough mounting system without it looking like a small roll cage so am 'throwing up the white flag' and going with a cable. My question is regarding idle speed control. I have a vacuum manifold connected to each runner that I can bleed air into via an IAC solenoid but how do I go about manipulating the fueling? Fuel pressure reg with be referenced to atmo. Motec M800.