the driveshaft angle is set.....that is based on your k member, engine mounts, tranny mount, etc. for what you need and doing your not going to worry about adjusting that, that is a fixed number for you.
what i do is measure the angle of the driveshaft as shown in the photo, i then remove the ds from the rear flange and read the angle on the flat part of rear flange. now subtract the ds # from the rear flange #. if using the pic above you can see it is at -4*, now lets say with your car being street/strip with radial tires and solid bushings i would set it at -1.5 to -2.0. In order to achieve this you would want to rotate the rear flange upward by adjusting both upper control arms evenly, it doesn't take much to get 2* out of it, adjust/measure, adjust/measure until desired setting is achieved.
NMRA Factory Stock #3 - Coyote Stock #3300
Thanks to: Ed Curtis @ FTI; Larry's Auto Machine; DeCordre Automotive and Performance
FS 10.79@124 CS 10.51@126