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There is no factory serpentine setup for a big block mopar so I can't see the aftermarket making a CW and CCW pump , those pumps will push water no matter what direction they spin .

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it's the 90 deg "paddle" that does the work & adding the anticav plate makes it a bit more efficient & is easy 2 do & reduces what the engineers call "parasitic recirculation" at all speeds and helps w cav at high speeds. It helps a little bit & is easy/cheap 2 do but mainly the others needs 2 b right (overdriven WP pulley imo) & enough airflow, adequate radiator