As far as suspension mods go I'd look into the Ground Control coil over kit with Koni's. Fully adjustable coil overs that, at their top most setting, are just about the same as a stock SVT (slightly lower) and can go like 4" lower if you really want that down and dirty look. The springs used with the ground control kit are Eibachs also. Check out
http://www.spmotorsports.com/contour_coilover.html for more info on the ground control kit. Leda also makes a nice coilover kit but it's a good deal more expensive (nicer too!). I'd seriously consider a Quaife LSD if you are installing the SC, it'll make a world of difference with that much power.
Good luck!
