Engine Out of Balance?

[sleeperstang]

I finally narrowed down a powertrain vibration to my engine. It's been there for a while, and to be honest, I only think has gotten slightly worse. I know that Ford S/B's are externally balanced.

As far as I know, the engine damper has some sort of rubber that after a while might move or shift or do something that would affect the engine balance. Would it be a good idea to replace this damper with a new one? I know 289 v8's use a 28 oz imbalance, so would it be safe to assume that all 28 oz dampers are made the same and are exchangeable?

Eventually I will have to rebuild the engine anyway, but at the moment I fear the vibration could get worse and may damage the block in the long run. What suggestions are there to repair engine vibration other than a complete rebuild?

Thanks!