Most pro touring applications are going for a fairly level stance. Most intake manifolds are milled at 4 degrees to level the carburator. To do it in a conventional way, meaning driveshaft on a downward slope, you will need more like 2-3 degrees of driveline slope. With these low ride heights and 4 degrees of angle you can't achieve a downward slope in the driveshaft unless you set the pinion up at an angle not equal to your driveline. Now I agree when setting up corresponding driveline angles, the car being level is not important. My point is simply if you are going with a custom set up you have to start somewhere. I know on my car the rockers are wihin .5 degree of level at ride height. You can always figure that out and take that into account when setting your drivline angle.
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Todd
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