No! The V-6 does not have a IRS. The IRS is usually found in the SC or Supercoupe a super charged hot rod version of the T-bird. Also, check some Cougars they had the same running gear.
Check the Factory Five Racing forum, there are always people buying and selling them there. FFR sells them outright for around $1800.
http://www.ffcobra.com/cgi-bin/ultimatebb.cgi
Good luck...