Many online carb CFM calculators are out there, but a 302 such as this street driven one shows a 399 CFM at most with a redline of 5000 RPM. Of course that is way too much RPM for these engines on the street, so a 390 carb should be more than enough for it.
Jay, most of the Ford V8 engines that used the Autolite's mentioned above were anywhere from 260-302 cubic inches, so ideally the same as the inline 6 Chevy 250 and 292's, and of course most of the Jimmy's from 270 to 302.
