I just got my UMI Panhard bar and LCA combo (Unadjustable) types, for my stock ride hight 83 Z28, I have to wait for spring to roll around to install them though

I was considering lowering the car 1" though and using some LCA relocation brackets, after hearing above and what others say, I will get some of those in the spring with my lowering springs.
I was having a lot of problem with lateral shift in the rear end after I jacked up the power about 3 times what it used to have so from what I hear, worth the cash!
Now I gotta do the same to my 82 Z28, which was lowered about 20 years ago by chopped springs, she needs an update. It as a similar power upgrade.