Doesn't sound like OP is still wanting the Heritage Grille. Motorhead is right though if you do decide to buy it, have it painted all at once since your painter will have the paint made up from the hood. (I'm assuming the hood will be mainly black like your car?) Or if you are painting the grille black, just buy it later pre-painted. Here's the link to a GM pre-painted black one.
http://www.gmpartsdirect.com/results...umber=20999488
If you're not planning on getting the grille then just buy what you can afford now. Who cares if the hood isn't functional if it looks good. And you can always put on a pre-painted grille later yourself. Only takes a few hours.