Sounds like a 2 core radiator Mark. It worked on the 340 I had in it before but now it is hopped up and going to have headers. I think it will still work but I would like to get rid of the 7 blade fan.
With my 360 I had to put a shroud on the rad and that worked perfectly even on those really hot days
You can probably pick one up a lot cheaper that I did. Just need to numbers off the rad to get the right one.
I'd sell you mine but shipping would kill ya.