Info needed for 4 link geometry

[Tri5Nerd]

Using Hotrodrookie post:
http://67-72chevytrucks.com/vboard/s...d.php?t=348682
I would some help with setting my Triangluated 4 link up.
My truck is a 55.2 Task Force series, shockwaves for the 4 link.
The wishbone I have is 24" long from center of heim joint, 27" wide from outside of bushings.

How long should my parrallel bar be? using Twisted Minis drawing I would try to get 45% between the lower bar and the wishbone.
What other measurements would I need to set this up correctly?

Thanks
Tri5