DS 21° , Pinion 19° in finished product. Had SYE already installed with lift and D35, measured DS angle. Placed and tacked 8.8 perches in correct location in garage floor using cheap but NEEDED angle finder.
I am SUA so I flipped axle over (where perches would stay put), set the pinion at 19° (off 90°) with a little bottle jack under pinion. Remember axle is upside down so perches will stay put (SUA) so pinion will be angled toward floor. Then I set perches at 9/16" out, 0° and tacked them.
Put 8.8 under vehicle, spot on. Took 8.8 back out and welded stuff up. DONE.