just wanted to add this to the H.A.M.B..i was looking all over the H.A.M.B for this info and found very little on 4-link bar angles..anyways hope this helps someone... http://www.thedirtforum.com/4link.htm
The basic strategies outlined there are aimed at circle track use, mostly dirt track. That article risks confusing folks as to street and drag race setup. I would never, ever design a street/drag setup with the upper link running up hill. The practices shown here are about traction forces under power, not necessarily in a static launch. There are better references out there for uses other than dirt track.
For truth, rarely if ever does dirt circle racing tech cross over into street use. I like this one much better. http://www.racetec.cc/shope/
Those dirt track setups are designed to include rearsteer to thier advantage, very treacherous for the street.