The speedometer went out at 253,000 miles. The problem was in the transmission, but it did not stop me from driving it. I did not want to take out the transmission to replace the driver gear just for that. It is now fixed since I had the transmission rebuilt once it started to slip.
The radiator went out when I hit a deer doing 60 miles per hour. I could not complain being that it bent the valance panel and dented the grille when it pushed in. I replaced the radiator and was back in business.
This car is very roomy and it turns a lot of heads.
The 283 / powerglide set up is not for racing, but more of a cruising car.
I know how you feel about never parting with the car. I feel the same way about my 1976 Monte Carlo. Check out my review and web page sometime.