What style of hunt are you doing? Are you baiting or spot and stalk?
Bears are hard to judge. Look for a big head and small ears..... and a crease in the head where the muscle has been built up. Bigger bears also have a swagger when they walk.
Aim well and shoot straight....... good luck on your hunt.
If I had more info I might be able to help you out but I have never hunted in NC for bear and every area is different in some way or another