Need some opinions to make a good street suspension
I just wanted to add that all the outfits that make front sway bar kits (Addco, Hellwig, PST, FirmFeel) also make rear kits. And all sizes of torsion bars are available from many sources, including Summit Racing, FirmFeel, and Mancini. Shop for price on t-bars -- they are basically the same. The sway bar kits have different fit and features.
I would consider how you are planning to drive the car before going whole hog on the suspension. If you only drive to cruises on weekends, do whatever you like. But if you commute, or take long trips, I would keep the spring rates moderate (maybe .890 t-bars with a small block, not .920 as some have recommended), and count on the sway bars for roll control (that's what they are made for), with poly endlink bushings for quick response. Also, if you think you'd run it at the drags, then you don't want to make the front too stiff. Finally, it is kind of pointless to go for a maximumly stiff, gokart-like suspension if you aren't going to commit to serious tires. That probably means 17-inchers, and good luck with that if you stay with the 4" bolt pattern. Think package -- every part should be "tuned" to about the same level. No point having "Stage III" spring rates and "Stage I" tires.
Here's another great source for parts. Get on their mailing list.
http://www.manciniracing.com/