Fiberglass hood mods... crazy?
It actually does make a pretty noticeable difference , I built a (pardon my language) 93 chevy silverado GT stepside short bed regular cab 350 v8 auto race truck and ran the ram air ducting on it....truck ran very nice and had a good bit more of get up and go to it.
As for the cooling aspect of it. I am sure it would knock the temp of the engine down by alot as you can direct the cold air where you please such as directly on the block which would keep the engine cool and cool down the hole engine bay do to the extra wind in the hood area and the lower temps of the engine.
but again....won't see much difference in the stop and go traffic, pretty much a "in motion mod" lol.... hope this is something you will try!