I have a set from a 74 chall. I'm also in NY.
I finally got or power back, and I dug out the seats and have some pictures for you. The drivers is worse than the passengers. Both need new covers, I would say the drivers need seat foam and backfoam. passengers could use seat foam or possibly use the original foam for now, the passengers back has two open seams that probably can be repaired and the foam is decent. If your going to replace the seat covers and some foam the density of the the old and new probably would feel and act different. I notice that there wer missing plastic hinge covers on one seat, if I find them they are included, there is also one missing chrome knob the one that you unlatch to flip the seat foward to gain access to the rear seat, I don't know if I have that piece, I don't remember seeing it, but would be included if I find it. Seat tracks were sold awile back. They still have the seat presence switches. The frames and spings look good. heres the link to the pictures
http://s1131.photobucket.com/albums/m543/brotow1/1974%20challenger%20front%20bucket%20seats/