I have the same problem George. I'm using a 69 318 a/c radiator and I picked up shroud at carlise this year and it is round at the top where mine needs to be flat.
I can't check the number on my radiator right now as I dropped it off at the rad shop yesterday, but are the 318A/C radiators the same number as the 340 without A/C?
What number is on top of you radiator? I will post the number on my 340 radiator in a few days when it comes back. I know it is original to the car with the 1968 date on it.
What shroud number did you buy at Carlisle?
Just curious.