I know on one of the many machines in this household we have a copy of the TSB for the "death flash" I think it might have been 09-06-99. Before Dodge started calling for a replacement of the Plenum plate there was a flash to the ECM to drop the fueling or something. It was a band-aid that ended up causing more harm that it cured.
CCD if you haven't looked over it yet here is a thread covering the Plenum replacement
http://www.dodgeownerforums.com/smf/index.php?topic=9504.0
I think Hughes recently updated their kit to come with the cross-over hose & the thermostat. So some of the 'extra's may not be needed anymore.
I did have the plenum replaced with a hughes kit.