I HATE dished hoods on sprints & midgets when the number is in the bottom of the dish. It makes it very hard to line cars up under caution when you can't tell what the car number is until you can see the number on the tail.
Here are two examples from Dave Merritt Photo's. In the first one you can see the number clearly.
http://www.pbase.com/pitpass/image/115129724
http://www.pbase.com/pitpass/image/115129710