I've never looked up Steada springs before. Steeda Sport, Competition or Drag springs? The Sport and Competition lower the car 1 to 1 1/4" inches. The Drag springs not much at all. I would assume you have the 650# Sport springs and not the 850-1050# Competition springs. I've also never cut springs before so someone else will need to answer how much to cut off. I'd start at a half coil. You can alway cut more but its really hard to add.
I don't know how your car is going to handle with those springs. The Sport spring are supposed to be paired with 250# springs on the back but the stock springs are only rated at 210#.
P.S. I throught the Drag springs were interesting. The two rear springs are different weights.