I think that if what was said above is true, about the exhaust manifolds, that there is a 2bbl and 4 bbl and there is no HP exhaust manifolds,that has also helped fuel the confusion.
Because everyone says the HP exhaust manifolds were only on HI-Po engines(AKA MAGNUM/ROADRUNNER) And my 69 charger 383(blue 330hp) 4bbl with A/C has duel exhaust and the four barrel exhaust manifolds.
So by seeing the four barrel exhaust manifolds and everyone calling them HP manifolds you would think that I have the HP engine (AKA MAGNUM) when it is really the 330 hp version.
and I would guess that unless you can hear the two engines side by side to hear the different cam shafts(if you can even hear a difference)that you could paint a blue engine orange and slap on the pie tin and then confuse the hell out of everyone!LOL
So I bet the exhaust manifolds added to the issue we are talking about.