Chrysler had done a fair amount of aero work by the time these scoops were released. They weren't made functional for two reasons: they were not high enough in the air stream to capture adequate air flow and the two holes opened up are not large enough to feed a well built big block at upper rpm range. If you look at any Chrysler competition scoop of the area, you will see that they are taller and/or larger for these reasons. EG, the RO/WO, A12, AAR, and TA scoops.
Would they help exhaust some heat by allowing some boundary layer air to flow through them and out through the engine bay or by convection when sitting at a stop, yes, provided you did not enclose them in an air box.
If you did want to open them up and build an air box under the hood to enclose the air filter and mate to the hood, they would feed cooler air to the engine than what you would get under hood. This air flow would probably be adequate for the street engine under 400 cid and living under 4000 rpm. Beyond that, I would be afraid of limiting the air flow of what the engine would need for peak performance.
Now, would it look cool and be unique? Absolutely. But from a pure performance perspective there are better way to achieve the goal.
