Dart 340 twin hood scoops
On A bodys they were strictly for "appearance" It would have been cool if Chrysler had designed a "ramcharger" setup like the B bodys used, but probably cost prohibitive
I love the twin scoops on all Dodges.
However, even on the B-Body Dodges with the Ramcharger set up they were not very effective.
For the power that they supposedly gave, they weren't probably worth the added weight.
They were a sales gimmick for the most part.
The problem was that they were trying to capture surface mounted air movement, and other than at low speeds, there wasn't much to be had.
Now, the Six Pack hood was very effective on the '69 1/2 cars because the opening was big enough and above the boundary layer in the flat part of the hood.
This is what I read in the Direct Connection book years ago.
My opinion on them is that they look fantastic and on an A-Body, and with one that has the 4'' holes under them in the hood, they might be functional in the way that they would let hot air out of the engine compartment in slow moving traffic and cause some underhood circulation to take away some heat at normal speeds.