I'd probably get in contact with Greg Luneack and get a pair of Tri-City Launcher springs as opposed to fighting some unknown 002/003 springs if you really want to avoid the Cal-Tracs or ladder bars. The Leaf-Link will rip the spring eyes out of the leaf springs, not to mention oblong the mounting points.

If it was my car, and the provisions are there for the ladder bars, then I would do a ladder/leaf floater setup at the power levels you're looking at.