Rebuilt 351-C dampers are available from most engine builders, or directly from "Damper Dudes," in Redding CA (I think).
Removing the undercoating is plain miserable grunt-labor. There are NO shortcuts. Some use a propane torch & putty knife, some use solvent and it's possible to use dry ice and a hammer. ALL are difficult & dangerous (the last can give you frostbite)
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