mikeg1955 those ID don't seem complete for the 55 year or others around it.
Can you post a picture of the ID and where they are located to get a better visual.

This link will help you decode yourself until the history buffs arrive

https://chevy.oldcarmanualproject.com/models/engine.htm

I good news for you is I have a 1956 3200 and I am straight down US 23 from you near suwanee.