i did a three link on the front of my 88 sammi in 3 days, didnt follow any of those calculations you are talking about i never even read a thread on how to do it. i just started doin it eyeballed most of the work used cherokee coils with 200,000 miles on them real flexy, the onlything you realy have to worry about is the trac bar you want it to be with little angle as possible and also make all of the links adjustable and beef mounts

i broke my trac bar mount on the axle the first time out with the suspension came home welded it back on with some gussets ive wheeled it harder since and havent had a problem. it also does pretty good on the street would do even better with a swaybar but its a wheeler so.