Functional twin hood scoops

The A-body scoops are better at letting heat out of the engine compartment than introducing any significant volume of fresh air. As already stated, the first couple inches (ish) above the hood sit in a boundary layer for airflow. Even at speed there’s very little velocity to the air within that layer. Think like an eddy in a river. And the A-body scoops simply aren’t tall enough to get out of the boundary layer. So as a part of a ram air or even just a cold air intake they’re pretty much useless. They let some hot air out, they may introduce some air from outside but not any significant amount or with any velocity.

That’s why they raised the T/A hood scoop up off the hood. The exact height of the boundary layer depends on the specific aerodynamics of the car.

If you want a cold air intake, picking up air from behind the grille and routing it around the radiator and through the radiator support would be a better bet by far.

I have the A-body scoops on my Duster if it makes you feel any better, even drilled the holes and run the factory gaskets. But it takes more than a couple of holes to make them truly functional. The engine vacuum alone won’t be sufficient to pull air from much further out than the plenum you’ve created under the hood, and since it sits at the top of the engine compartment it’ll be the hottest part. The engine compartment sees air flow anyway, everything that goes through the grille goes into the engine compartment and then out under the car at speed. It’s why these cars with their large flat grilles tend to lift at speeds over 150mph. You can see Chryslers fix for it right on the Daytona’s, they reduced the frontal area and added downforce.