I installed a 6 row rad in my 06 with e 6V92 and a Teal o-drive. It did not change the temp it run at all so I installed a 10 blade fan with a good shrould and that worked for me.
On a normal day temp gauge barely comes off pin.Have to partially cover rad to get heat and defrost in cool weather.
If you experience high engine temps and you have the original, functional bus heat, you can open your bus windows and turn it on. Not very comfortable, but better than a trashed power plant. Does anyone know how large the heater core is compared to the radiator? Must be big to heat that much space.