Quote:

vibrates in neutral reving at 3000 rpms nothing was balanced

1971 340 where internally balaced form the factory, the 1972 and 73 340 ad all 360 where externally balanced Take the flywheel and clutch pressure plate to a engine machine shop and have them check it for balance If it vibrates in neutral now with that flywheel and pressure plate and it DID NOT VIBRATE before the new parts are your problem, unless it has a tuning issue

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