Up for Buy-It-Now is a new old stock oil pump, GM part number 669105.  This item was obtained from an old service garage and is not a newly remanufactured part.  According to my vintage oil pump catalogs, this is used on the following models and years:

1965-1972 GMC Truck V-6..305-C, 305-C, D-351, 351, 351`-C, 351-M, 379, 401, 401-M, 432, 478, D-478, DH-478, 478-M; Replaces pump w/ Hyd. Governor spinner EFF w/ 351-027300, 401-020650, 478-003238 Engines. The pump has 3/8" mounting holes.
  
  The pump is in brand new, never used condition and shows no indication it was ever mounted or installed.  The assembly is covered in a light coat of grease from the manufacturer. Although it has protected the assembly, it has attracted dust bunnies and shelf dust from many years of shelf storage.  Most likely will need a light polishing up before installation.  The original GM box is in fair condition.
  Please feel free to E-mail me questions.  International bidders are always welcome.  Thanks for looking!!!!