Inliners.org has casting numbers listed. Reprints of original shop manuals are available from any repro parts suppliers and on ebay. A Motors or Chilton manual that covers your vintage would also work for most things also. Hemmings Motor News is a good starting point for parts info. If the engine is a 55-57, then a '53 manual would not be useful for the engine as they are very different. I would advise getting a factory '53 version for the truck and a '57 or equivalent for the engine. '56 was a suppliment year, so go for the '57.
