Need help to identify years

Lots of guesses in this thread! This is not a slant-6 radiator (bottom hose fitting in wrong place). It's for a '64 Dart, Valiant, and Barracuda with a 273 V8, automatic or manual transmission. Does not fit '63 or earlier cars (no V8 available), does not fit '65+ (wider radiator mounting pattern).

If the upper hose fitting were moved either several inches to the right or slightly to the left and the lower hose fitting and the drain **** were swapped, the result would be a radiator suitable for '63-'64 Dart, Valiant, Barracuda with slant-6 engine.
Yup, and if you wanted to use the factory lower hose for that year, you would need to make the lower hose connection curved like the original or use the later, straight pipe type hose. Also, the small block V8's used the cast iron water pump through '69 and started the aluminum ones in the '70 model year. The timing cover, balancer, brackets, and pulleys were also changed at that time.