You can cut it but you do have to do some clean up work or you can replace it which takes drilling out all of the spot welds. I have done it both ways, just depends what you want the end result to be. I just did a 69 Ply wagon and I think an E body is similar in that when you cut it out there is a raised part that will remain up at the top that needs to be cut off or it will keep the radiator from sitting flush.