They can be found, but all of them aren't indicative of the mileage. Mine was given to me by the original owner that started a frame off, then let it sit in a parking lot for 12-14 years. Needless to say, the engine was toast and so was the frame. The odometer has 62K or so on it. And it will never move again thanks to an LS swap and no more speedometer cable.Can't imagine there are too many G-bodies out there that haven't rolled the odometer.
I was fortunate to find a very good frame here in the rust belt.
They are out there at less than 100K, but not always what you think a sub 100K mile car should be.
Regarding yours, I would start out listing it for no less than $7k. 5 years ago I would've said less than half that, but they are actually climbing in value.