After figuring all the flow requirments and the cam profile it showed a min of 700 cfm. I made calls to Edelbrock and Holley tech lines and with our set up they recomended the 750.
We have Dart Iron Eagle heads with a Comp 12-432-8 cam.
KB 100 Pistons.
We are leaning to a Speed Demon. A bit pricey but with the ease of adjustment and the overall percision of the unit it looks like this is where we are going.