Duster front grill swaps.......

It would stick out farther then the grill. Look like a monkeys' but.

Well, I dunno about that but it definitely wouldn't look stock. :p

Here are the issues, helps to put them side by side. The '73+ grille, hood, lower filler, and bumper are all peaked in the middle. In addition to that, the hood has sections that are raised, as well as sections that are lowered, compared to the earlier style. You can see on this '72 (bottom) that the hood and grille surround are flat, same with the filler and the bumper. So if you installed the earlier grille on the '73 up car there would be a vertical gap between the grille and the hood in the middle, as well as a very narrow gap or even contact between the hood and grille surround in the lowered section on either side of the headlight bezels. And then there's the peak, so, the hood and lower filler would stick out past the grille.

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The nice thing about a '73 is that you have a non-shock mount bumper. So, if you wanted to keep it a Duster but switch to the earlier style front end you would only need the hood, hood latch panel, grille, lower filler panel, bumper and brackets. Yeah, that sounds like a lot, but you can keep your fenders which is more than I could keep when I did my swap. And all of it will bolt on. Well, you may have to add a grille bracket or two to the fenders. But all the big stuff will bolt on, and then your car would resemble a '72 from the outside except for the taillights.

Thought I saw in one of your threads where you did the whole front end

Correct. I swapped my Duster over to a Demon. That requires everything though- hood, fenders, hood latch support, grille, bumper, bumper brackets, and lower valance. The works as they say. All of that bolts on though, I was able to buy an entire front clip from a guy that was parting a '71 Dart.