Okay, are you using your leaf springs to support the car or are you going to use coilovers? If this is a drag car with solid rod ends on the ladder bars you'll want 0-1 degree pinion angle. If you are using the springs to support the car you will need a rear axle floater kit or you'll have serious binding! I suggest coilovers.
If your using coilovers, remove the springs, have your car at ride height with the size of tire your using, you can support the rear of the CAR, support the rear AXLE and centre it under the car, rotate rear axle to the pinion angle, assemble the bars according to the instuctions, make sure they are equal. install brackets to bars, with the bars in middle hole they sould be level with ground, make sure they are square and tack them on.
Once tack double check everything! then weld up solid if everything check out.
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