Forget about the CFM of the throttle body and look at what HP the system will support. The number and size of the injectors is more of a determining factor as well as the pump volume to support the injector size.

Case in point, "I believe" the FAST EFI throttle bodies are the same size for the EZ efi and the 2.0 systems - but the 2.0 uses 4 more injectors to up the HP handling capacity. Likewise with the FiTech systems.

If you want the RIGHT answers, you should ask "moparrich" who is a member here and the FAST EFI guru http://www.fastmanefi.com/