rear drag springs?

im looking into getting more power to the ground and want to put in some new springs in the rear. i have the UPR anti-roll bar in my garage ready to go in and would like to know what springs i should get. the moroso's are out since one is stiffer then the other and i was told thats not good when running an anti-roll bar and eibach seems to only sell their springs in sets of 4 and i only need the rears. does ford sell some rear drag springs? who else has good rear springs for drag racing. do i want stiffer or softer springs for drag racing?

this is my daily driver, already have mega bite jr lower arms, umi uppers, and pinion snubber
thanks
 
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