Need Some Rearend advice please>>>

I am sure this has been discussed here before, but I'm curious what your thoughts are. I am looking into putting a transbrake into my Dart, along with a delay box for top bulb racing. My current engine is a 499 big block, but I am considering going to a pump gas small block, somewhere around 400-450 horsepower. My main reason for doing this is, the big block is just too darn expensive to run week in and week out for points bracket racing. I have to run 110 octane in it, and being 500 inches it drinks alot of it. Not to mention that I really don't need the big motor since all I run is weekly bracket shows anyway. Now for the main question, will my 8 3/4 survive behind the mild small block with the trans brake, if I keep the launch at around 3000 or less? The 8 3/4 has a stock case, spool, and 35 spline Moser axles, but its not backbraced, but I will likely do that if and when I make the switch. Thanks for the help, and sorry for the book:yawinkle: