Bob, how much RPM do you see with this motor ? or intend to see ?
5500 RPM ? than Id use a 600 cfm.. personally I like Holley over Edelbrock.
6000 RPMS ? than I like the 625 Road Demon from Barry Grant
6500 RPMS ? probably not based on the info you gave...but just in case...Id use a 670 Holley Street Avenger