Width of the radiator is not as critical as the core thickness. One of the things you need to consider is how thick the core is. The Griffin at 2.5 is pretty fat. Our A bodies have very little room between the radiator and the water pump snout. Space is a premium that needs to be considered.
Going in an E-body but I don't know that there is all that much more room side to side or front to back. It's been torn apart so long I don't remember. Going to have to find some pics from other cars to remind me what all is up there.