what kind of power is a 23 spline 833 good for?

Putting a stroker together for my swinger. It is a factory 833 4 gear car. Trying to decide on dumping the stroker in it with the 833 or go w a built auto. Mildish stroker around 500/500 is the goal. Got a 428 HP 340 in it now but tq is only 405. I'm curious if 100 more ft lbs of tq will break stuff.