A 18 spline 833 would be marginal with a stroker if you did not have the blower on the street let alone a 23 spline. I used to break 23 splines with a 340 and dot drag tires. The only way that trans is going to live at all is if you never get on it. I would not waste my time breaking a good trans. Take your time, save some more money and do it right. Whats the use of building a 900 hp car if you can't get on it? I would break it the first day I was driving it.