[Mr70]

It did not matter where it was originally built at.
Begining in 1970,if the vehicle was to be sold Brand New in the State of California,and some parts of Nevada,it had to have RPO NA-9 known as E.E.C.-Evaporative Emission Control.This is the Charcoal Cannister capture & return line system w/under carb.cooling plate.
Not to be confused with the A.I.R. system,which is the Smog Pump and Diverter Valve system in which All Solid lifter engines were built with,regardless of where sold new.