I suppose most of the general population wouldn't know the difference between the GMC/Chevy front end, and probably wouldn't care. This is a very specialized board, however, with many members who are experts on the 67-72 trucks. If you're going to sell to someone here, you should probably consider the audience and be as specific about the details as possible. You're going to get all sorts of questions. Don't mean anything negative... just want to offer some friendly, well-intentioned advice.
It looks like a very nice truck.