How much does a hood scoop actually help?

While I think hood scoops look cool, some research might be needed.
I don’t know how far back from the front edge of the hood you need to be, but consider-5.9 98 Jeeps had vents in the hood that used the low pressure zone created by the front of the vehicle to draw hot air OUT of the engine compartment.
Definitely seal the carb to the hood, but do you get any benefit other than temperature? To get any ram or forced air effect, you might actually have to get up pretty high to get into a real air stream.
I’m considering making a ducted cowl air intake & keeping the flat hood.