I'm looking into the springs now, and here are a couple pics of some options:
I'm thinking 280's for the front with the 6" spring, 336 is probably too much. That was what I was actually thinking for the rears if I go with the "all out" option, run those with Raceng rear 1" tophats.
But if I go with helper springs, I have NO IDEA which ones I would pick! I'm starting to research methods for calculating helper springs, but I'm starting from zero on this so any input is appreciated: