You could grab a leaf or two from the parts XJ and stick them in your current leaf pack, the longer leafs will give the better ride but of course adding more stock leafs will give lift but also firm up the pack and it wont flex as well. There's always a compromise.
For the front a 2" spacer will get you the lift but again new coils will give a better ride and more flex but the spacer will get the tyres under there.
All up that would be a very cheap 2" lift, less than $100
Cheers
Steve