Not sure what the budget is, but I'd say do it in this order;

alignment - You may have the DC recommended drag alignment so you'll want to change it a bit. Set it at desired ride height, as much positive caster as possible, 0 to -.5 degrees negative camber, 1/8 to 1/16 total toe in. This may be a bear with manual steering, but will improve the car's cornering manners. The need for power steering after this will be a personal preference.

front sway bar- the need for this is a no brainer. Figure $150 for a solid bar, $300+ for the tubular Hotchkis

shocks - shocks are to the suspension like a cam is to an engine, important to defining operation parameters. Your CE units can be dialed back to 50/50 for now, but then step up to some real good units, like the Bilsteins $300-400

t-bars, step these up if you want to firm things up further after feeling the results above. $200 on sale.

firm feel box - Unless it is really killing you with the alignment, I'd wait until here to install it. The box itself doesn't improve handling, but it does improve your feel. $300+ for box plus you'll need pump, brackets, hoses.

rear springs - SS units have too much camber, plus more rate than you would want with a rear sway bar. You'll need to flatten them out with a more OEM XHD like configuration. Maybe pull a couple of those half leafs out and see how that changes things. free - $200

rear brake kit, skip it altogether. No need to rear discs unless you're road racing it regularly.