What rear suspension for bracket racing.

Has the quality of SS springs improved recently? For several years there were a lot of complaints about the quality.

If 11's were what I was planning on running and had no plans to go faster I'd just run the factory HD springs, clamp the fronts, pinion snubber, /6 bars in the front and a good shocks. If I were planning on stepping up I'd go straight to ladder bars or possibly a four link.

Yes, if you get Mancini's, General Spring's or ESPO's versions. They are all the same thing without the inferior metal. The MP springs you're talking about were all made in Mexico, but not all of them were bad. There was a bad batch of spring steel and that's how they got that reputation. Even so, I still would not use the MP versions.