Spanky,
I called a friend who works with in the national auto parts dist network and he confirmed that the correct fuel pump for your air brake equiped 470 is an AC 7007. He indicated that there was no "new" fule pump which cross references with this pump. His records inidcate this fuel pump was used only on GMC 400 and larger trucks with air brakes. We even checked a few of the mid 50s Hollander exchange manuals and even these manuals show this fuel pump as one off pumps for your truck.
I do see one seller on ebay has several NOS units for a fair price.
AC 7007 Fuel Pump - EBAY Bob
