How about forward facing scoop vs rear facing

If you want the look then its Hemi all the way imo. But if you actually want it to be functional, a cowl is where its at.
Its been tested time and again and a cowl is just more efficient. Areodynamic wise its easy to see but it actually keeps under hood temps down better by venting hot air instead of forcing cold air in.

Ive got a pic on my other computer of a 71 swinger with a cowl that looks mean as hell. will post when i find it.