Wouldn't Caltracs be a cheaper option and do the same job?
 As written above, 90/10's in the front, 6cyl front springs, 30/70's in the rear, only 4 leaf springs (6cyl), caltracs, mini tubs if necessary and 10.5"+ rear slick
 no 2 : Don't plan on seeing the track for the 1st 60-100 feet in your car
I had Hallam performance redo my springs and remove my lowering blocks. Tractions good with just the leaf springs but it weight transfers reasonably well. You can see it in a photo of my car on the http://www.fullboost.com.au
website. No wheels in the air but good weight transfer.