trans brake question

Ok this might sound stupid but I'm going to ask anyways. I'm trying to put together a motor that should maybe hopefully make 500 horses on the bottle ok and I have a stock 999 tranny with a turbo action reverse manual valve body from cheetah. what if I get a tranny brake how long will it last? How dangerous is it? and most importantly will my car do a wheelie? ok ok I know you can't answer that but will it help me out a lot.