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The question is:
Can we make the airflow cleaner than otherwise? Cleaner enough to be worth the effort?
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Depends on the car. My Superbeetle has a positive displacement pump that moves air from the engine compartment into the shrouding. Streamlining is not an issue.
The Dasher has a rat's nest of hoses and cables and wires. More modern cars have coils right next to the spark plugs and covers for the bumpy bits. Look for show car engine compartments, the have flattened firewalls and hidden wiring.
Most of the internal drag is in the radiator itself.