I tried a search but could'nt find what I was looking for.I have a 70 gmc and want to put a 68 chevy grill in it.do I have to change the front clip or can I get away with just the core support.thanks

Your fenders are the same.The hood,core support,and grille panel are different.

thanks.

The core support will actually work, with a small amount of mods. I couldn't find a 67-68 chevy core support when I was putting one of my trucks back together. Iused a GMC core support and ground off the dual headlight brackets, then soldered a set of chevy(single headlight) buckets on the support. It looks different than a chevy but it functions perfectly with GMC fenders, inner fenders, bumper to grill piece and 68 chevy grill, hood, hood latch and bumper.
I didn't have a welder but brazed it with a gas torch and brass rod

Do you have the GMC grille still? Wht kin of shape and is it for sale?