It comes from the Decoder off one of those Mopar decoder sites. This is why I asked the question on the post above. Also on another decoder site it states what you have stated Dan. On CC.com there is a post about V08 on a 1970 Barracuda or Cuda hardtop that is on that tag.

Now also on 1970 E Body Tags was B51 put on from the beginning of the 1970 Model year or not at all. I just wonder why someone would order a car with P31 and P37 and not add Power Brakes in some form or another.