How much difference will it make?

TRACTION BARS !!! OMG !!!!
Lol
I run 2800# SS springs (2 driversides to make it sit level) ,
Rear sway bar , adjustable shocks , pinion snubber , traction bars , 255/60-15 MT SS drag radials.
I just threw the kitchen sink at it...lol

Honestly you might want lighter rear springs unless you plan on running some serious HP and high rpm launches. That is if you dont want to install lighter torsion bars .
I dont think the rear sway bar will effect you at your current power level .