Don't know if this has any relevance to what you are trying to do, but I'll throw out a couple things that I noticed pretty quick. (I am a 68-72 Nova Guru after all...haha
The rear bumper (to me) appears to sit up too high on the tailights (wacked in the rear at some point?)
The two front fenders are twisted upwards. The "eyebrow molding" should be level across the top and a straight line across the front of the hood.