Rochester Quadrajet's

1970 Ford 429 CJ and SCJ Brochure

States that the Rochester Quadrajet Spreadbore is rated at 760 CFM's for the
Cobra-Jet.

And the Holley 780 CFM for the Super Cobra-Jet.

http://amradio.freeiz.com/turbocoupe50/429cjscj.jpg