I dont think you will need a body lift.
The reason being that with a solid axle you can achieve 6" of lift with the suspension alone. The geometry problems you have with the IFS kit get thrown out the window. (but get replaced with driveshaft geometry problems, which are fixed with the Slip yoke eliminator and CV shaft)
So theres no need to lift your body up unless you wana run real big dogs (like 40's or something. but unless you had some REAL good gearing, and a bigger engine, I couldnt see tires that big working on a trackick)