Rear end set up

Anyone have any tips or tricks?
10 bolt GM.
In the past on cars I've hung them on leafs and put the weight of the car on them to set pinion angle. Rotate the rear and weld on the perches but as this is everything that hangs it, how do I determine where the brackets get welded to the rear. I bought the Ron Pope Motorsports parts.
Thanks for any advise.

 

Thank you. I was trying not to bother you too much.

 

hey ron i wonder if this would be of use to me as well.