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The side louvers do almost nothing. The area behind the wheel well is a low pressure are, so there's no draw. Airflow inside the engine compartment is blocked by the wheel well.
Phil Hill's car had louvers punched in the hood for air flow. Apparently, that worked pretty well.
A stock 351W should not be producing that much heat. Since you already have a shroud and a decent fan, you should look in other areas for sources of heat - timing and mixture.
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