Here's a pic showing the difference from the side.
hoods.jpg All the front sheetmetal is bigger.
The Grill bars themselves are taller but can be made to work on a half ton with the right parts, the top bar will just smile

a little. Most people won't even notice.
And if you wanna see some really big sheetmetal look at what was on the really big trucks.
GMC620Hood.jpg MONGO