Aero difference between 67/8 and later hoods?

[BigSky71]

When I restored my 71 I installed the early front clip because I wanted the sloped hood. Now that I am driving it again, there seems like there is a lot more wind that hits the windshield with the sloped hood vs my original 71 setup.

I didn't notice this before when the truck had the stock more straight up hood. Now when there is any head wind at all the truck feels like its struggling to power through the wind. I first thought I had some motor issue or a tranny slip, but it runs great on the fresh motor and I had the tranny rebuilt this spring by a reputable local shop and I installed a new torque converter.

Any one else felt this difference between the early and late hoods? The lack of aerodynamics is actually pretty annoying on the highway at speeds above 60 or so... like trying to throw a brick through water, lol