12. integrated j 78 - The WCFB and Autolite 4100 look good too. The air flow requirements for a mild GMC 302 are about 400 CFM. It's like an overgrown 235 or 261 Chevy, with a 4 in bore and stroke. The head design is poor with 3 intake ports and 4 exhaust ports. It's ported with larger valves. The cam is a mild Isky 3/4 cam that idles very well. It pulls my 3400 lb 40 Chevy coupe with a T5 and 4:11 rear nicely. Currently run 3 small progressive Webers with about 600 cfm total, but 395 CFM Holley seem to pull better once it gets through low rpm flat spot.
