What about sealed (to the carb/air cleaner) vs. non-sealed hood scoop ? work

I have a six-pak scoop on my Dart's glass hood (single 4-barrel on Edelbrock RPM manifold with 1/2" nitrous plate and 1/2" phenolic spacer). Air cleaner is 14" open.

I think that the scoop opening is admitting more cool air to the engine compartment, but not as cool at the air cleaner as a sealed scoop would.
On the other hand, if air is getting "behind" the radiator via the scoop, it could be impeding the flow through the grille. Seems like a trade-off between intake temp, coolant temp and engine compartment temp.
My brain hurts shruggy