Champion radiator for ~500hp small block??

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.

another thing is where the aftermarket radiators core is positioned. Many after market radiator to core support side flanges push the radiator back closer to the fan.

That’s why stock recored radiators don’t have fan clearance issues, IF you run the correct fan clutch.