/6 to 360 swap

I am swapping my Demon's slant six to a 360. I called a radiator shop to buy a better radiator, and they said the radiator for a demon/duster 340 in 1972 is only a 2 row radiator, which is the same as I have now. (The radiator in my car is not original). Is that correct, and will it adequately cool a 360?