Greg, Dick Ruzzin and Jonny Woods wrote various articles, this is one I could find quickly which explains, and I have incorporated this modification on my car.
https://pantera.infopop.cc/top...ruzzindesign-aol-com
There are various points covered, all good to incorporate as you move forward
there may be other posts as well.
I spoke to Jonny, basically most of the arms have rose or Heim joints. One that doesn’t is critical and a lot of people have incorporated joints at each end. This stops the rear wheel going toe in to toe out as it travels up / down during hard cornering.
That was a major criticism in the day. keep the original arms but suggest you consider the extra joint.
Ps I’ve sent you an email regarding the steering rack
cheers