Someone is feeding you a lot of BS on the band apply!
You can make mega HP and it has nothing to do with any limits with band apply in low on braking.
Is just a better way to build a MVB and still keep more safety in her.
I have a serious amount of $$ in my 727 in my 64 Dart and even have a case modiied with a bolt in 8 bolt sytle extreme HD sprag, dont think there is a tuffer one.
But trust me, I have had drive shafts break, u-joints, done serious water burn outs etc and blew up several cases on the nex launch.
I now run the band apply style and a safety blanket.
I want to live a lot longer and the trans built like this is a monster.
In fact as I mentioned you could get an entire MVB from Cope for not that much $$, but atleast talk to him, he is the guy...
good luck:)