Saturday, made some progress. I put in the passenger side C-Notch. Here's some pics of the process:
Drilled out the rivets and removed the old bump stop. Then I made a template.
I then used the template to draw where to cut. I also made templates for the bottom front and back of the C-Notch. So the frame cuts line up with the C-Notch if I want to weld it later.
Jacked up the rear end to make sure the cut would be centered on where the bump stop will be. Note I shifted it backwards from where they said by 1/4".
Maked sure the 2 brake and 2 fuel lines were out of the way.
Made a notch in the spring plate going by the template.
Went to town with saws-all.