Radiator has shot craps

I know this is an old thread, but in which way did the KKS rad not fit? Did the rad support holes just not line up? Was looking pretty hard at one of these since the inlet, outlet, overflow nipple orientation, and mounting tabs look like it will be perfect for my sons 69. Will be running a 74 engine in it w 74 water pump and timing cover. So it will be lower right, upper left hose connections. If it's that the holes are a little off, could they be opened up to fit ?