The 69 Road Runner that I am getting ready to purchase has an aluminum radiator installed. I would like to switch it back to the factory correct style radiator. What I am unable to determine is whether it should be a 22" or 26" radiator. I have seen pictures with both setups, but I want to make sure it is right. The car is a 383 with automatic transmission (with power steering if that makes any difference). Not sure if there would be any other indicators. Would appreciate some feedback.