My Dart has a .30 over balanced 318 with 340 intake, exhaust, cam, carb, and windage tray. 360 "swirll port" heads & electronic ignition. Trans is a 904 with a reverse manual valve body and high stall converter. 83/4" rear with 391 gears and a shur-grip. The best run was 15.6, 80mph at altitude...