Hey Dominik
Have you looked at these they are designed for a big block.
http://www.gforcetransmissions.com/tran_gt-56.asp
Even if you had the G-force T5 with the 600hp rating it would probably need the stronger case, and the drag boys are blowing them but they are doing in the 9 seconds quarter miles, but I guess anything can blow when you start going that quick!