Really nothing has gone wrong, just routine maintenance items. I have had to replace the radiator, starter, battery, shocks, alternator, tires, but hey, one would have to after 20 or so years!
The 225 slant six is an extremely durable engine! So is that smooth-shifting Torqueflite automatic transmission, shifts better and smoother than my 1998 Honda!!!!!
My wife wrecked our 70 Dart Swinger twice. Both times I used a "come-along" to pull the front end out enough to get the radiator out and soldered. Only cost me $25.00 both times to get it back on the road.
Happy to report that the car is now restored and still runs like day one, with over 200k.
Well at least its still going.. Love that slant six... best engine ever produced!