GMC fo' life!
It's gotta be a full-chrome GMC grille, though. No black. My favorite would have to be the '68 GMC frontend...followed by the '67 and '69-'70 GMC frontends...then the '67-'68 Chevy. The ones I just listed are ones I would leave on a truck if I did another project; any others, I'd change to one of the above.