'71 Duster 340...maybe...

I'd love too see the fender tag. The gloss doors and lack of A pillar trim lead me to believe it's not a V24 car also. The rear tail panel decal is for a 1970 Duster 340 and the wing as well. The hood pin cables are also too long. I suppose if it is a truly early build car then it's possible to have these things, but unlikely.
I'm not sure what your looking at on the tail panel, that you belive is not correct.....but that is how all 71 340 dusters that have the tail stripe, should look and is 100% correct, along with the " duster 340" lettering. Some cars like the orange one above, that did not have the tail stripe option, just have the" duster 340" lettering.