Just get the Reilly Motorsports Street Lynx for the Rear, It comes with 12" 175"/# Springs, I swapped Mine out for 200"/# Springs.
And then Build / Upgrade the Torsion Bar Front suspension with Proper 1.03" or Larger Bars, Sway Bar, Good 16:1 Box, Proforged Rod ends and Ball Joints, Skookum...