Speaking of disconnected speedometers, it was epidemic in the old days. Had to stretch out that warranty as much as possible you know.

Now, with restored cars, it doesn't much matter whether the mileage is 80k or 180k miles.
We had an unrestored '67 Chevelle a few years ago. In the early '90s it was an unrestored class winner at a Super Chevy show. I saw it a couple of weeks ago and you would never know that the car has close to 100K miles on it. The interior is still mint. I don't believe that the car was ever left outside. You could spin the speedometer on that car back to 40K miles and no one would be the wiser.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.