Mike
The Hood Scoop or reverse air induction we built was actually made to help evacuate the air coming in the radiator ... it is working like it is suppose to ... if you notice I did not bring it close to the windshield even thought the Windshield is very short anyway...
No we did not make any patterns.... we just sat down and figured how we wanted to make it cover the large Air Cleaner we made and move air out of the engine compartment.
I've Attached a few photo's to let you see what you need to see. We have a large hole in the hood that the scoop cover up and it works well as we do use a Holley 4500 1200 CFM and it works great