I might know a little about this one. How many miles are on that Mach 1?
The Shifter knob is incorrect, the lower door panels need attention. How are the quarters?
The interior is in good shape, the undercarriage looks like there is minimal rust but you will never know until sandblasting is done.
My guess is somewhere around 22-30k based on how much work you will need to do to that one. M code with 4 speed is nice. You can put the correct stripes on now as they reproduce them. Indian fire red paint is ok looking but you will probably look at a repaint somewhat soon.