I'll add that Plymouth did almost the opposite- the 66 and 67 B body had hood ornament CID callout for all but the slant six (blank area on ornament) and the 273 ("V8" call out).
All others had the CID in the lower ornament area, and...2 barrel engines background was black, while 4 barrel engines background was red. The only one that could have either, was the 383 in 67.
It always amazes me, the extra trinkets and tooling Plymouth div had vs the comparable Dodge models that almost certainly added to production cost......to the line marketed as "lower cost".