The damper assy is essentially two pieces made into one with rubber which is vulcanized between and to both parts. Sounds like yours may have come loose. Only cure I know of is to find a good one or have yours revulcanized. Steele Rubber offers the service but a cheaper alternative might be Damper Dudes.
http://www.damperdudes.net/ V8 dampers have been known to crack at the keyway. Not sure if that is an issue with earlier ones.
Another possibility is do a search on site for Ford dampers. One former poster mentioned there is one that will bolt up. I don't know for sure if anyone ever tried and there may be pulley, seal or other issues. He had made the suggestion because you could get extra pulleys for those wanting to add AC.
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