I never saw a U.S. spec two barrel car with a "non AC" radiator from new, I think they were so equipped given the likelyhood of having AC added, and the cost difference to the factory was likely nothing. The core size and thickness is the same on AC and Tropical radiators. Therefore, if you have a donor AC radiator, you can have the complete bottom tank swapped to the replacement radiator, I just checked the dimensions last week.