I understand about the engine ratings being the same on paper...........As far as I knew--it was a 400HO with a longer duration cam and valve train hardware , which made it a "Ram Air" engine
I did know my friends brother was constantly on the phone with factory reps.back then--he would always say the engine was being factory blueprinted. Don't know if that was actually the case,?? but the the car did sound nice and did run strong...Another buddy of mine had a 400HO with 391 gears/4speed and you could hear the difference in the engine lope...That Ram Air/433 was a real nice package...
Photos and a very
classy ride..Your car brought back a lot a good memories