[Woodz428]

Any 429/460 harmonic damper should work. In '79 they went to an external balance, but there is a "hatchet" behind the damper and a weight on the flywheel. A harmonic balancer is not a weighted object always, their primary purpose is vibration "damping" as the name implies.On the 429/460 it isn't, on some Fords it is but not the 385 series.