Doing an overhaul/tuneup, down to valve cover gaskets and removing the cats for cleaning. There is some sway/torsion bar in the front I read is a real SOB to replace the wear parts, should this be easier to do with cats and manifold gone?
Going to replace most sensors, temp, cam, maf, oil. and fuel filter, plugs, coils, injectors, all gaskets, 02 sensors. Alternater and wata pump recently replaced.

Any inexpensive parts come to mind I should consider replacing during this process? Timing chain perhaps(doubt cheap but)? 204K miles now.

p0420 and p0304 codes and rough running, remained after plug and coil swap so going all in on the repair, I want the jag to live!