The rears easy, the front takes some work or some money (or both)
You might look into a TnT truss, I believe they make them for Waggy 44's now, otherwise it's a good 15 to 20 hours of fab. to make all the brackets (well without a CNC machine anyways). The truss is probably cheaper if you have to pay someone for all that fab. work.
Rotating the inner C's is not to bad of a job, and there's alot of benefits to doing that.
But I gotta say, if your gonna go thru all that work and expense to get a Waggy 44 in the front of an XJ, why not just spend another $100 or two and get a HP44 instead. Much stronger axle than the Waggy 44.