Welcome aboard!
Mods are dependent on what you're wanting to do with the truck, and sometimes (like it was for us) it can take a little while before you know which way you want to go with it.
Engine-wise you could look at blocking the EGR if it's not done already, and fitting a catch can. Not sure if your model has an intercooler or not, if it doesn't, put one on the shopping list (possibly one from an XR6 Turbo Falcon can be adapted).