This is the RamAirbox system in my '68 Dart GT with a 383 Big-Block.
Hood is from a OEM Dart GTS.
Carb is a Holley 750 sitting on top of an Edelbrock Performer RPM manifold. There are no clearance problems .
I got the "Ram Air" kit purely as a Cold Air Induction system. It works well.
The difference was noticeable. Acceleration response was increased, and in fact the car felt, immediately after the retrofit, as any car acts when driving on a slight downhill. It just went slightly farther with less effort at the Accelerator pedal