I don't think so... it looks smooshed on there pretty good, I think the 67/68 hood still wouldn't fit behind the grille.
Check this awesome truck out:
http://67-72chevytrucks.com/vboard/s...highlight=hood
Honestly, if they didn't damage the hell out of the fenders installing that grille, and you already have a 67/68 core support, I'd made the truck look like a 68. Good used hoods go for $100-150 and used 67/68 grilles go for about the same, maybe a little more, but good ones are hard to come by... but then again, all you need for yours to work right is 2 fenders and a core support... may be about the same cost-wise. I guess this all depends on what you like better.