Not interested in causing a train wreck so I will just add this.

For a long time, I have not paid attention to ICs or anti-squat numbers. I am only concerned with geometry; upper and lower bar angles, front and rear spread and height, percentage of rear spread above and below the axle centerline, etc. These are the things that determine what happens when torque is applied to the pinion.

I've seen old 4 link brackets with the holes in the wrong locations, front brackets in the wrong place, things that make it impossible to put the bars where they need to be. Sometimes it's not as simple as moving a bar or making a shock adjustment.

Torque and stroke matter. Effective low gear ratio matters, as does many other factors. Shocks and spring rates are more important than most would think.

Once a base line is established, the car will tell you what adjustments it wants once you get it to the track.