On my 90 GT I put the following suspension items....
1.5" lowering springs subframe connectors Monroe Formula GP shocks/struts urethane sway bar bushings I also have Southside traction bars which replaced my horizontal rear shocks, but that was more a traction thing and not suspension. However, doing this allowed a bit extra inner clearance for wider rear tire/wheel combo.
I've taken some pretty sharp turns, and had friends driving behind me say they saw no body roll. Anyway, combos vary, but my choices worked for me. Best of luck.
Oh, one more thing.... If you choose lowering springs, and have not already installed an adjustable caster/camber kit, consider it a requirement. A good set should sell for around $175-200, and allows for adjustment of these two measurements after front suspension modification. Without it you're likely to have front tires that severely lean in at the top, and excessive premature inner tire wear.
Randy
90 GT
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