if you are going to drop the $$ to replace all of that you should do the tundra brake upgrade. wouldn't cost you much more and really beefs up the braking on the 3rd gen 4runner. Did it to mine, loving the decision to this day, only wish I could easily go discs in the back.
Hard to find Specs, Info & Measurements on 231mm 13WL Tundra Calipers & Rotors - Toyota 4Runner Forum - Largest 4Runner Forum
just a thought.
edit: this was a partial necro on this thread, but in case anyone else comes looking on the370z.com for 4runner advice i will leave it up.