I thought I replied several days ago, but it ended up being one of those ghost posts....
So, if you remove the front doors, the Grand Prix front clip should fit. the trouble will be aligning the doors. They have a different contour between the rear edge of the fenders and the front edge of the door. Top edge of the door won't transition to the fender correctly along the top edge without a lot of trimming, grinding and shapeing.
Also what was said about the bumpers not really matching.
And like was said earlier, the Grand Prix(with buckets and console) has the best looking interior, hands down, of any G body (or technically A Body)