looking at the discussion on Facebook and looking at all the pictures you've posted so far, I would get a laser (or if you don't have one, a string), find center on the back of the cab and center of the windshield. Luckily, Chevy built in a peak over the windshield just in case we don't trust the guy who installed the windshield rubber. Extend that straight line over the front of the vehicle so it shines on the hood, grill and bumper. This way you can see what exactly is out of alignment. Get the radiator support set centered. THEN work on centering the hood on the cowl to support.
