Out of all of the 70-73 second gen's, the 73's bring the least with the lower HP. However, being a 4 speed (if original) helps alot. Does the VIN have a "T" in the fifth spot?
Without pics, and FWIW, here is what I see. Try
www.nastyz28.com as well, they are the second gen experts.
In sloppy, bad condition but running, I see em in the 3500-5000 range, good driver NOM condition 5-10k and in great condition # match 10k-20k