As I recall I used a floor jack (with a rubber pad) to hold up the sway bar up with the bushings and brackets. Attached it to the a-arms properly got it centered front to rear, side to side and then marked the chassis using the brackets as a template. Then I drilled the holes for the brackets then reassembled. I will get some pics of the installed unit.
Jack pad -
http://www.prothanesuspensionparts.com/191402
The POL sway bar comes with the brackets to attach it to the POL a-arms.
Okay I installed it (originally) with the a-arms level and there was one factory hole I used see 2nd pic.