Mat,
Mine has 2 sets of lower mounting holes, about an inch apart. Maybe LS has changed that? I'll run out and take a picture later and post it. The 4-link bars you are refering to are supposed to be mounted in the upper and lower position for street use, and the inner holes for drag racing. I've been playing around with the position of mine to see what changes it makes. I think the bars should be more parallel than what they are in the outer position. I move mine to both lower holes on the bottom bar but moved the upper bar to the lower hole on the rear and left the front in the upper hole. That made them almost parallel. But the weathers been bad this week and haven't been able to drive it. Theres a good site that explains 4-link geometry, but it's a little over my head.
http://www.thedirtforum.com/4link.htm
RB, as you said I had 1/4" threads showing on my coil adjustment before I moved to the lower hole, and 1 1/2" now, so I gained 1"+ on the travel. Like I said, I post some pictures later. There's a thread on the LS forum called "my build pics" by aggiejack that shows the two hole but not clearly.
Brad W.