Mopar P4876074 mechanical pump (Info needed)

That's as good as you get.
from that it's likely a Carter M6902 which also advertized a 120 gph free flow.
http://www.heritech.org/cuda/fueldelv.html#Pump Fit Issues
I don't know if Ryan Brown is testing pumps anymore. I would have sent him more at the time but only had the three to test.
Yep, I saw the graph and noticed no stats for the carb that the op had questions about. Great information there.