FYI - There are a few suppliers who produce pre-fabricated louvered panels that you can graft into your existing sheetmetal (hood, etc)...I noticed recently that Eastwood even started carrying them. Might be an option for you.
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1969 Camaro/ Tom Nelson TT 434 / Wayne Due C5 / DSE QLink / and a bunch of other stuff...
Rob, I noticed an ad for something like that in the back section of advertisers in the lastest issue of Car Craft. No idea who makes it, I just recall there being a picture of it.