Keep in mind, the Mustang 2 front end is not designed for truck use, it was originally meant for 1200# compact car. Personally, I do not care for them, there's much better systems out there for far less. Like R-Bo states, check out Scotts thread, very informative.
In addition, something you might consider as an alternative, is a dropped I beam from Sids. That'll allow you to keep the stock frame, no cutting/welding, with the stock or even lowering springs. There's several power steering and disk brake kits out there to fit the stock axle.
