Dan, This is the 72 V code car I am working on.....Would almost have to be a RR/GTX as that is the only way to get a 440 in 72, correct?
As for your research, are your above pics of an original paint car?
This car had been painted earlier in life so that history is gone.
Just doing some addition research on this in a 1976 Mitchell crash book. Only shows the engine call out decal in 1971, does not show it for 72.

Mark