Does anyone have a book or know how to decode a turbo 400 vin tag?

 

Why they're all basically the same. All you need to know is the two numbers on the lower left of the tag are the last two digits of the year.
Other than that it's obvious to see if it's a switch pitch, bellhousing pattern tells you what it came out of, same for tailshaft type/size.

Unless you're doing a concourse restoration.