[WSSix]

Welcome to the site! I think you're on the right track with your rear suspension desires. I would also recommend while you're working on the rear suspension that you build the rear end up to handle launches on drag radials. You'll want to weld the axle tubes to the carrier housing after getting the tubes squared. You might consider replacing the axles themselves for stronger units, and get yourself a structural diff cover like offered by TA Performance.

Good luck.