8 3/4 Rearend Question

I pulled my 8 3/4 rearend out of my Duster last week for a rebuild and axle upgrade ($345 for axles!!!Moser axles with Green Bearings, Better be worth it) and give my old cut down C Body axles away. My question is do I install a drain plug in this rearend or leave it stock (it's an original A-Body rearend)? I do change the rear center when I go racing this is why I ask.
To bad its not a cut down C Body and then I would care and just put one in it.