Re: New 04 WJ owner. Lots to do :(
Rockauto sells the Spectra premium radiator for around USD 110.
The 242 T-case should bolt up to the 5-45RFE tranny adapter housing, you will need an other T-case shifter assy and maybe also different propeller shafts, not sure about that.
Maybe an other member can chime in on the manifold bolts. Are the bolts sheared of flush with the manifold, or do they sit deeper? If still a piece sticks out of the head, you could probably put a wrench on it and get them out, otherwise just with easy outs. The access to them is an other problem.