With the paint job and brake leak, I'd be really cautious of the mileage. I'd believe it a lot more if you put a 1 in front of that 25k.

In northern Colorado, a low mileage 79 in perfect condition, with verification of mileage (repair receipts, fuel receipts, registration, something) would probably bring $3000 to $5000 depending on options. It would have to be a perfect specimen, though. A 79 in very good condition with no rust and a nice interior would bring $2000 to $3000.

BTW, take a look at the brake and gas pedals. If that thing truly has that few miles, there should be virtually no wear on the pads. If they're worn smooth, or through, someone's lying. Same thing with wear on the carpet. At 25000 miles, the interior should be near perfect with only light dirt and/or light staining.