Just Scored new 904 for my Duster

I just scored a TCI 111300 904 Street Fighter Transmission and a TCI 141300 Breakaway 2400 stall convertor. Is anyone out here familiar with this set up? I am going to install this next weekend, looking forward in seeing better launch from my Duster with this combination. Will I need to upgrade the factory flex plate for this set up? Please post info on this setup if you have any knowledge about it. Thanks!!!!