I can't see the top rear of the hood, but it looks like you can open both sides of the hood a few inches and push the hood to the rear some. This should help a lot, but there does appear to be some frame bend at the rear motor mount area, as the bottom gap looks to be more than the top gap at the rear of the hood.
The radiator pads should be no more than about 1/8" thick, and if you have more than that, removing some of the thickness will also help to tighten the rear lower gap of the hood.