I have in been do metal fabrication for 30 years now. I would hope I have the know how to do simple auto. Would I build a Engine, NO!
Heidts web site explains better then this guy, Richard/Dick
No pun Richard my Name is Richard also
I have been searching the wide world of the Internet for information about what you have
been looking for.
The B line between the upper and lower control arm pivots as shown in ITS10 diagram
Make an adjustable fixture (Fake rack) out of 5/8” all-thread and with 2 pivots point and all-thread nuts (Nuts made just for all-thread). Use the 4 all-thread nuts for your adjustment and pivots. Pivots. I use old swivel sockets and tack them the nut
So you’ll have 3 pieces, 2 fake tie rods and a fake rack.
You have to make the fake rack adjustable for up and down, forward and rear movement
Take 2ea. 5/8” nuts and tack 2 pieces of 1/4” all-thread at 90 degrees.
Find some angle Iron or make one long enough to clear your frame and cut slots on the heel and toe of the angle so when the angle iron is attached to the vehicle you can move up, down, forward, and rear. The 5/8” nuts and tack 2 pieces of 1/4” all-thread can be bolted to the angle.
Attach the angle to the frame some how so it will not move.
.
Look at Fig. 4 http://www.heidts.com/heisinfo.htm you’ll see where I’m going
You’ll see .060 of movement just setting the fake tie rod on the tie rod knuckle
and bouncing the vehicle
You’ll soon find the sweet spot, youll know exactly what rack measurement you’ll need.
If you need a pic of this I can send you one.

Rick