Chevy to gmc fenders hood question

[Iz-T]

Hi, guys.
My gmc was changed over to Chevy cosmetics back in the 80's
DSCN4329 by Turley Knives, on Flickr

I'd really like to put it back to what it was, put a gmc grille back in it.

My question:
Am I gonna have to get gmc fenders and a hood also?
At first I thought maybe they just swapped out the gmc grill for a chevy grill. But now I'm thinking they put a whole new front clip on it.

Any help you could offer would be appreciated.