Jim,
Racecar scales do not set up suspension. They help you meet left side legal weight, get percentages where you want them, and most important get cross weight workable, and finally meet total weight legal limits, but they do nothing for set up. None of this is important to a street car. The ride height is the critical measurement for this. That is the height that the four corners of the frame are above the ground plane. Crank the coil overs to whatever it takes to get this right. Something like a battery on one side will require the coil over on that side to be cranked down farther to get the car to stay level and there will be more weight on that scale, but you are not trying to get the weights even, just the car level. From there look at a camber/caster guage liike Longacre and if you really feel inspired, a bump steer guage from them.
