Engine color
Here is one thread that has some discussion of this. Likely other threads out there.
I have seen early 340's in a reddish color as well as reddish 273's.
1969 340 Engine Color | For A Bodies Only Mopar Forum
The site MyMopar.com may have some information as well. It is a good source for decoding and other reference materials
MyMopar - Mopar Forums & Information - MyMopar Tools/Reference
Print