When we rebuilt the \6 in our 80 Volare, I sent the damper (harmonic balancer) away to 'Damper Doctor' out in California. I am very satisfied with the rebuild and cost, though to be 100% transparent, they DID send it back to me the first time with the pulleys put together backwards. They explained that the tech thought it was for a different year...they took care of it 100%.
Lucky I had taken pictures of the "before" and looked at them before i put it on the engine.
But I would use them again.
They also stock dampers that are already rebuilt.http://www.damperdoctor.com/