Rad Swap??

Anyone know for sure??
I have been offered a /6 rad from a dart, 74 I think. Everything about it matches up with the installation and 72 v8 block (except upper outlet) that a shop can move over. I have been also told.... the cooling system maybe too small to keep the v8 cool. Just "Eye" balling and size looks no differance???

I know it's better to be safe...however, anyone know for sure?