I bought a flat hood from AAR and had to cut a hole in it for the dual quads. I called AAR since I would have been cutting thru the bracing/structure. They instructed me to buy a celotex styrofoam insulation sheet. Following their instructions I cut some strips and placed them on the underside of the hood. I completly glassed them over and all was good. The hood was structurally sound and my carbs and air cleaners were poking thru. (Added a scoop later)