727 for a 700hp big block

TCI has a terrible reputation with Mopars. That's why we say TCI stands for "Turns to Crap Instantly". Search a little and you'll find that out. There are so many great Mopar specific trans. builders why not go with one of them? Cope Racing Trans. that was mentioned is a great one. Another is Andrews Racing. A&A Trans. is another great company.