Progress on my 340 Hood Scoops!
The red outlines are the holes you drill first from the bottom side.
The orange cirles you drill from the top side.
After you drill the "red outlines" flip the hood to the top side. Align the hood scoops and get the placement of the "orange circles", and drill the "orange circles" from the top side.
The open slot has to be 4inch in diameter and needs to be 3/8 of an inch from the curver on the hood.
Hope the helps.....if you need more help, I took in progress photos.
-r