Screw the body lift, that just puts your COG higher. Get some good HD torsion bars like these from the Downey site and start cranking. I'm actually surprised that Marlin doesn't sell these.
http://downeyoff-road.com/SuspensionComponents/index.htm Too much pre-loading on the stock torsions will fatigue them and ride like a log truck. I have the Downey bars on my truck currently and am very happy with them! I have 33" BFG's with no body lift or trimming. It's fine. Make sure you get a gusset for the bottom of your A-arms. The bigger tires will want to spread apart there and screw up your IFS. Oh and I threw some add-a-leafs on to help the rear.
Happy trails!
