I was asked to do a tutorial on installing this brand of hood scoops to existing model hoods. I like using these better than using resin hoods, for various reasons, mainly the amount of work you usually have to put into a resin hood, I feel these scoops are less work. They can be adjusted to different heights, lengths, angles, and are open to lots of customization , and also cheaper, $3.99 for 2pcs.
Here's where I started from for this build, a '65 Impala.
Initial marking to set equal height
Rough cut
Sanding block to achieve levelness
After sanding and cutting rear angle and length