All those old cast iron sixes (Chevy, Ford, Mopar) were tough old engines. I'd have one today if I could find an old pickup in halfway decent shape that had one. Seems like at least with the Chevys, everyone tosses out the old six and puts a small block V8 in it's place.
My first car was a '62 Dodge Dart but it had the 318 V8 and the push button shift automatic. Drove it one time and then my step dad went to do a tune up on it. It never ran again. Wasn't the car, it was his mechanicing. The car ran fine until he got under the hood. Eventually sold it for junk.