[stovt001]

Well, as Rallysport mentioned, being a '73 model changes things. I had a 1970 model, 350 and 3 speed auto, fully loaded, green ext, green int, green top with 85,000 miles and all original condition that I just sold to a Swedish collector for $4,300. The miles were obviously much higher than the OP's, but the car was still in nearly mint condition. On the other hand, 1970 was arguably the high point for muscle cars, especially the A-bodies. 1973, much less so. But hopefully this gives you a starting point.