dam i wish i would saw this thread earlier.
-couple things that may help or may not. but coil spring rates are very simple to calc. Wide open desigh=n made a you tube that explaines it super easy. no scale needed or anything. i will link it.
How to Calculate Spring Rate for Coilover...
so i put brake lights on the other day, first time in over 5 years with brake lights on my wheeling rig. hahahah and i made a idle adjustment, and made a bash bar to protect my psc ram but after looking at think it has too much of a Jay Lenno chin and need to make it smaller so there is that.
i think thats the same one i use and i never had so good of brakes, dana 60 front and back. a pro. valve would be needed for street use but holly chit 42s it locks up like mad now. and i made a simple adapter, this was not my idea, i found it on here or the other site but works like a champ
i started one of these almost 2 years ago, sold it because my heart was not into making an 80 what i wanted to do, my problem was i already had a toyota PU that was a buggy so when i started this i did not have a clear plan like you have. Very cool cool cool