22 or 26 inch radiator

I did look up the vin and the car actually came with a Slant 6. As I said, Im not hung up on being correct, I probably ought to be paying better attention. At $50 each I might just pick up both. They are supposed to "not leak" but it was also supposed to have "had a 360". Whatever happens either one will work with the 318 that will be going in the car.
Thanks