Anything that diverts water will also divert air. I'd be worried about this defeating the purpose of having the vents in the first place if you start blocking things too much.
You guys do realize things in the engine bay can get wet right? Some dielectric grease on electrical connectors will help prevent problems down the road, but most of the connectors are already water resistant.
If you're worried about looks, some they do make high temp clear coat to keep the aluminum from corroding?
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