I searched last night to see what people have done for shrouds, and found Chevy inline six trucks didn't come with shrouds. At least that's what the internet said and everything is always true on the internet. From what I've seen in photos and videos, the fan sits pretty close to the radiator so cooling shouldn't be an issue with a 3-row radiator, but safety would be a good thing. So I guess I'll be fabricating one after the truck is finished.