There was an article in Mopar Collectors Guide a few issues ago about some fellow in the States that did those kind of repairs to mouldings etc.
I'll look for the issue and post it here when I find it.
Check out Hemmings website and see if there are chrome shops listed there, as sometimes they specialize for the antique boys.
Other than that, head for a couple of car shows and ask the guys there where they get their plating done. Triple plating is the only (read $) to go, but it is well worth it.
transman