Edlebrock makes a RPM head that has 75.0 CC chambers built to compete with the 440 Source head prices, I think Summit has them listed at $750.00 each scope
2.14 intake valves with 1.81 exhaust and they flow a bunch better than any stock Mopar head including the stock M.W. heads up boogie

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)