Can someone quote how much this worth? 69 Mach 390,4speed,tach,discs

there is no way i would pay 10k for that. jmo.
my feeling is that it might be worth 10-40% of that depending on the condition of things not known, like:

engine, tranny, rear, suspension
frame rails, floorboards, torque boxes, shock towers, cowl, trunk wells
headliner

how much is it worth restored? depends on the type of restoration. all out restoration....maybe 15-20k? regardless, it looks like you would be into it for at least what you'll get for it.