hi, ok I looked up cam specs, both 4 bbl 318's used same cam, .390 int, .420 exh. difference was in cylinder heads. one had 360 heads with 1.88 & 1.60 valves, other had 1.78 & 1.50 valves which is a 318 head. both used same intake and T.Q. carbs. these specs are from NHRA , and from mopar.just food for thought. I also found same specs in my mopar race manual.
