A lot of results depend on design. Unrestricted airflow has more effect that aerodynamics at your proposed speeds. Simple is better.
I ran a single carb 301 Chevy in a "Brick" ( I mean Street Roadster). I made a scaled down version of a Pro Stock Scoop. We ran a best of 168 MPH. I "designed" and made a thru-the grill system and went 25 MPH slower. Removed the cover on the hood and modified the front of the plenum, stacked two 11 inch air cleaners (thanks to Mike & CARQUEST) into the air stream and went 170 MPH.
A blown engine is certain to be a little different on how it likes to see incoming air.
Sometimes we tend to overthink things.
Tom