Relocation bracket bolts?
#2
You'll want the rear control arms to at least sit level or with the rear of the LCAs(axle end) to be a little lower than the front, at ride height. BTW, this is for street driving, for drag racing you'll want to drop the rear LCAs down to a lower mount point.
#4
For drag racing I always suggest customers run them at the most agressive setting, the lowest hole.