I don't know. I never had a 72 Dart with a 440.

I had one with a 360 swapped in place of the 225 and I used the OEM V8 radiator for that swap. Worked fine and I was in Tucson and ran the factory air as well.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.