that depends on to what level you take it. On the cheap side you relocate the metal lines, simply weld perches on top of your axles and possibly modify drivelines. Total cost less than 2 bills.
I wouldn't put those dinky springs back on a build up rig though, I'd be swapping the entire suspension, and I wouldn't run those stock axles so I'd ditch those and then your going to need to set your caster and then and then and then..
This Space for rent!