I'm running stock 56s. It barely has 4" of lift.
I moved the hanger as far forward as possible (roughly 7.5"). This moved my axle forward ~4.5".
With a Superlift 1104 pitman arm, with the springs flat, the pitman arm barely doesn't get caught between the two U-bolt nuts on the spring plate. This is with the U-bolts cut flush with the nuts. Looking straight down on the vehicle the TRE is right between the nuts when the steering is centered.
I have the rear axle moved back ~3". This is about as far as you can go without hitting the gas tank. This pretty much limits you to 113" of wheelbase.