Spring Perches question

Ok, so I am doing the exact same thing as the OP. I am about to weld perches for my Moser 60, I am also swapping in a T-56 and have yet to fab the crossmember. Driveshaft is installed and trans/diff are mocked up. I will be street driving and track any chance I get. What angles should the trans, driveshaft and pinion be set at? I see your explanation Trailbeast , just trying to get a better understanding. Thanks!