Awesome A-body air dam for under $30!

1971 CY Dodge Dart said
https://www.spoilersbyrandy.com/70-72-dart-demon-pt

My car is the last one on Randy's site now in the above link. I can't see how it improves cooling though.

i think it would catch air and then force air to spill over to valence opening, around the sides, and underneath it.