Best street susp setup?

I would put atleast 1" torsion bars in. Call espo and order a set of xhd rear springs with stock, +1 or +2" height. Front and rear sway bars and a firm feel stage 3 power steering box. And just as important a good set of tires. I would go 17 or 18".

All that's assuming that the front end is in good shape. If not rebuild that with quality parts.