C-notch with centered rear

[hewittca]

Hi guys. I'm debating on if I should build my own notch or if an off the shelf one would work. I was hoping someone would have some insight or experience with a standard c-notch to answer these questions.

1. My truck will have a total rear drop of about 7" and I was thinking about shifting the rearend 1" back to center the wheels in the wheel opening. I'm wondering if I were to go with a standard c-notch, would there be enough room in the notch to account for this?

2. My truck will be static and I am trying to get the ride height to a very specific setup, so I'm trying to account for every variable. I noticed all the standard notches have a piece that extends under the spring mounting location. It looks like this would add about 1/4" to the height of the truck. Does anyone know why this piece is necessary and if this has practically changed the ride height at all?

Here's the CPP notch which is pretty much what they all look like. Thanks for any help!