Ederbrock Carter AFB 9755S

This 9755S is supposed to be 750 cfm. It is a square bore, based on the pictures. Is this going to work with my 440?

If not, any ideas of where I can get a working 750 cfm for that 440? (see "buid for Imperial" thread for details). I am picking up the car today from the transmission shop. I have a feeling that the carburetor I have there will not work too well. So, I am looking for alternatives. I have a 650 cfm AVS, but I expect that will be too small for the engine.

Thanks
Author: demetri