Starting a BB Duster project

I'm starting to round up parts for a more serious transmission build. The 727 in the car right now is basically just a stock rebuild with some HD parts and a Turbo Action reverse manual valve body. I ordered up some of the good stuff from A&A. Billet front drum, 5 pinion steel planet assembly, lightweight sun shell, aluminum parking assembly with a governor delete and an ultimate sprag. I'm going to dry fit the parts together then take it across town to a pro and have him put it all together for me.
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Splain the governor eliminator deal to me ----------never heerd of it ! < okie from the sticks