I might have a little bit different horsepower than your car and an automatic, but what happens in my car should be the same as in yours. I avoided working on my suspension, aside from normal things like shock, control arms, and an anti-roll bar.
I bought a nice UCA kit from Baseline Suspensions, but could not fit it in my car and adjust it where it needed to be because the UCA mounts were pulled back about an inch.
I upgraded to a little turbo motor last fall. After that, I had problems with wheelies even after the 1-2 shift with a power glide. The car also was pulling the rear wheels into the body, meaning the rear end was driving forward well under the center of gravity. I had to jack the rear springs up as much as possible to minimize the squat. I was almost ready to put 26 inch tires on it to try and help get the rear of the LCA's lower and angled up more to the front. To run my car safely, I had to limit boost to 20 psi or less at the track start. That let me cut high 1.2 sixties, but not reliable and I had a wheelie issue down track when high boost came in.
Every stock location Fox I looked at has an issue with squat. My buddy's grudge car was terrible. He was constantly playing with shocks and ramping nitrous in slow. Anything you do to lower the car will make that worse, and taller tires will make it worse.
I bit the bullet and got the full Wild Rides S box kit. I needed to do this anyway because I am building a bigger engine with a lot larger turbo, and my floor was already a mess.
I got some good videos of my car and watched the rear end. I moved my LCA's up higher in the front until the rear pushed hard down into track. Now my 60 ft times are low 1.2's even at low launch boost. I've yet to hit it with the same boost as down track.
Doing this change, track prep does mean much. I can pull into an unprepped lane and do a 1.2 or 1.3 sixty without even heating the tires. I also lost the uncontrolled wheelies.
I fine adjust my car by changing spring height, lower if I want to reduce antisquat and higher if it needs more hit. I do some shock changes also, but I really don't have to change much unless the track is really bad.
I tried playing with the uppers, but the lowers have a much larger and more predictable effect, so I just left my uppers in a stock location.
Pinion angle does not make a noticeable difference on my car. I just set it so my driveshaft does not skip rope or bind the U joint. The LCA angle moves things all over the place. The UCA's, not so much at all.
I'll see what happens when a get a little more power, but I needed to get the chassis working reliably before stepping things up.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)