I'm sure you've heard this before, but you know you will have to change the front fenders as well right? 70 - 72 Dart fenders will work but make sure you have the fender extensions. And then a front bumper as well.
Yes, I took a front cap off a '70 Swinger. I also have a pair of '72 fenders that I plan to use. They have to correct marker lights and they are in much better shape than the '70s I have.
That car pictured above is freaking DROP DEAD FIIIIIINE!! That is pretty much the look I am going for. My car will sport the dual scoop that mounts in the center. I absolutly love that car! VEEERY nice!