There is no such thing as numbers matching on Ford's of this vintage as there were no VIN's stamped on mechanical parts until the mid 1980's.

Numbers matching is a GM thing.

A Galaxie is not a Muscle Car. The term was originally coined in the mid 1960's for mid-sized cars that used the large V8's used in the full sized cars.

The first Muscle Car was the 1964 Pontiac GTO that came with the 389 used in previous years full sized Pontiac's.