I think the 70's was for cars what the 80's was for fashion and the 90's were for music. Just not a whole lot there, nothing you're going to look back on decades later and still enjoy. I say this owning a 70's car- my 77 formula. I've always liked the way it looks. But I say that also knowing that for that car to be appreciated by others, it really has to be cleaned up and looking flawless. It has such a stigma as a redneck mobile, that's what most people see it as. Styling was just a little overdone, and god, the firechicken is ridiculous by anybody's standards (which mine doesn't have).
Some diamonds in the rough are the TA super duty and the dodge little red express. Not exactly a muscle car, but I think the Lincoln continentals are pretty unforgettable, especially with that grill and the massive size. Always wanted to take one on a long road trip.