Help with ECE drop kit

[john02fxdl]

Ok, I have a 70 shortbed stepside that I just put on a 4/6 drop kit on today from ECE. Only did the rear as my front end is apart right now. I installed everything correctly and went together pretty easy. When I lowered it down off the floor jacks, I took a measurement from the floor to the center of the wheel well arch. Driver side is 29" and passenger side is 28 1/2". You wouldn't think a 1/2 inch would make that much of a difference but it is very apparent. The track bar isn't adjusted yet because the front end is apart. My questions are:
1.Does the track bar adjustment make the truck level from side to side in the back?
2.Could it be that I have to adjust the springs on how they sit on the trailing arm? Maybe loosen the spring cups and hand turn the spring and tighten them again?
Maybe when the front end goes together and I get the front off the floor jacks and down on the ground, it will correct itself. Any help and/or suggestions are appreciated.