More Hemi Q's
I like your plans.
Remember the accesories arre different too, so you need car stuff also. I don't know about harnesses, but If it turns out you need one, I was gonna sella 2005 car harness on ebay or here soon. As far as the coil swap, the reason I was gonna do it was for looks... to get rid of the spark plug wires over the intake... (I dont know of other pros/cons) You need coils, valvecovers, and connectors on the harness. I believe you have to modify the ECU or find a later one so the spark goes where you want it.
try searching for factory service manuals for wiring... I am sure somebody here will know more.
JOE