Good, makes adjusting, dialing in, a new rear much easier.
Looking back through your posts and build you've been pretty busy with changing most everything in the chassis. From experience doing the same thing i find once you throw all those new parts from a whole lot of different venders on the car you need to insure they all correct out of the box. The LCA should be equal length and so should the UCAs before pinion and thrust adjustments are done.
I had Global rear non adjustable LCA for years and changed over to a Spohn adjustable. The Global length was 18 13/16" out of the box and the Spohn were 18 5/8", stock length is supposed to be 19 1/4". The UCAs are Edelbrock adjustable bought 20 years ago. When the Spohn LCA went in the UCAs were pulled and adjusted so they are equal length. Forget what they measured at that time but stock is said to be 11 1/4".
With all four links set pinion angle can be checked. Adjusting the UCAs equally to rough in pinion angle, LCA are not touched for this. Next is the alignmnet rack and set thrust angle by only adjusting the LCAs. Once done it's back to double checking the pinion angle and adjusting it equally on each UCA. The LCA isn't touched. Next front end alignment will verify whether the thrust angle is still good.
Most will say the rear in the car is not centered in the frame, fat tires will rub one side of the frame. Some will try to adjust the UCAs to move it left or right, not a good idea IMO. Different lengths of UCAs effects how the car leaves when launched, it will go left or right depending on arm length. Drag racers use adj arms to dial out those tendencies.
Pinion angle and thrust angle are two very important things to adjust especially when a non stock rear with all non stock arms are installed. After spending thousands to put some really good parts in the rear the 75 bucks spent on the alignment rack to know the rears thrust, toe, camber angles are good to go is money well spent. Never take for granted that what came out of the box is correct. Double check everything.
Couple years ago bought a Intercomp digital angle gauge for the front suspension relocation project. One of the most useful tool I've bought recently. Had one of those plastic angle gauges prior, have no idea where it is anymore, might have trashed it. https://www.intercompracing.com/digital-angle-gauge-p-99.html
On tremec's website there is an APP to download that will allow your phone to be a angle gauge. https://tremec.com/menu/tremec-toolbox-app/
Keith, nice build, keep us posted, I like seeing the progress.