Well, I'd think real hard about that; if you want your car to "kick some ***" like you initially said, the 904 will be your friend. Ask Ryan; his car runs 127 miles an hour, not because of, but in spite of that 727 he has...
He's thinking hard about pulling it out and replacing it wilth a 904 for the 2012 season.
Lots easier to do it now, than down th road. That Gear Vendors unit will likely fit either transmission witn minimal changes. Just a guess...