I found the numbers that I need. The engine number on the block next to the distributor is F248284I09. It has a separate casting number that begins with GM. When I entered the number on the door post into Vin buster it said my 54 is a 61. It looks like an original tag. It has deep inset rivets holding it on.

1956 Chevy 3600
“Maynard”
In the DITY Gallery
More pictures on Flickr