from my days working for the Big Blue Oval, I can say this;
it has part #'s consistent with 'test mule' pieces. Meaning, they are one of very low numbers produced soley for the purpose of evaluation. Most likely an emissions control study for the 1983 switchover from stright 6's to the 3.8L. Normally, these parts get recycled, or set to a training center for use as a training aid. I wouldn't be too enamoured with it, but it is interesting.