Coincidentally this is a 74 duster. I was looking at the same thing to lower the car and use better headers. The choice I made was quite a bit of work, but the key components are actually cheaper than any complete bolt on tubular k member kit that I could find.

[url=[URL=http://smg.photobucket.com/user/jkathe/media/20151213_130656.jpg.html][/url]

]photobucket[/url] I did have most of the material already on hand, but the strut kit w/brakes, rack, header kit dont cost all that much in comparison.