Gas, if you were looking for a power boost, you can save yourself some time and money by realizing that the Pantera engine compartment is at a slight positive pressure relative to the outside of the body. So airflow into any side scoops does not naturally happen until the boundary layer along the sides of the car thins with very high forward velocity- somewhere in the neighborhood of 150+ mph. Even then, any inward air flow is minimal. So for street driven cars even at 'arrest-me-instantly' road speeds, both the small and 'elephant-ear' side scoops are only cosmetic. They may be attractive but not functional. So bottom line- the hookup doesn't really matter in this case.
To demonstrate this at any road speed, roll the driver's side window down an inch or so, wet your fingertip and inch it out thru the very top/back of the glass opening. Your finger will detect evaporative cooling from air flow only after most if not all your finger is protruding (4" or so?) which is a measure of the boundary layer thickness only inches away from the rear quarter window opening.
There are also illustrated articles elsewhere from the Swedish Pantera club some decades ago in which they did tuft studies to map side and rear airflow. There are also articles in which, even at Bonneville speeds, indications are that functional side scoops if firmly attached to a carb, tend to mess up fuel/air mixtures, confusing tuners & possibly damaging the engine by going lean. Sorry-