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