699/187 Oil Pan

My 440 was swapped into my car by the previous owner. It has a painted steel stock looking oil pan with no numbers stamped into it.

From pictures it looks identical to the 699/187 pans with the notch on one side.

The 440 came from a 73 Newport I am told and has a 72 build date on it.

I am trying to check the accuracy of my dipstick as per Mopar Action tech topic but am unsure of the original capacity of my pan. Any ideas?

The sump to the rail at the lowest is 4 3/4" and 5 1/4" and the deepest.