My 1957 312 that I recently purchased has a factory FoMoCo dual point distributor.  It does have vacuum and centrifugal advance.  Was this an option used in the Thunderbird engine?  Back then I don't recall ever seeing a Ford dual point distributor in the cars.  The numbers on the distributor are:  COAF   12127-A     Y  9KG      The number 1 between 12 and 27-A is only half of a one or perhaps a line separating 12 and 27.

buddy