Go to this link for an explaination in detail.
http://www.camaros.net/forums/showthread.php?p=413681 Basically you need to "Rotate" the hinge back. Your problem is VERY common. Most guys will lower the hinge all the way down and think that is lowering the hood, it isn't. You need to rotate it.
Even with worn hinges on most cars you can put the rear of the hood MUCH lower than it will even work. So when they are worn you simply put them at the lower end of those worn pins, make sense?
It is like a saging door, if you raise the door up so it aligns, what you have done is simply put the door up so the worn hinge is "right".
Brian