Try some pull-aways on a straight LEVEL road, with steering wheel basically light-fingered. Don't lose traction but surely have the posi working or a working posi.
If the car wants to dart left or right then the frame is jot square, making a lower arm appear too short. Offset bushings are avail, or if you can dig it, like i did, you can offset the sleeve in a lower bushing (rattail the urethane & shim with copper, or similar). Upper arm will likely need a tweak, so if adjustable, then you will know the correct length.
I used the " long-string method " to measure the front alignment and rear track. The string method confirmed the rear track was off, then corrected.
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