Here is a list of everything I bought to do the 5.3 Swap into the Gray Pearl.  This list includes a wideband and HPTuners which could save you $700 if you already have access to something equivalent, but also includes the $500 I got for selling my old power train, so the ~$2000 swap cost isn’t too far off.  I’m really not satisfied with the engine mounting situation that I have and I need to buy a driveshaft that is the correct length still.  I will update the list when I add things (hopefully turbo)!