How much did you have to pay for that thing?
I think there are better transmissions available for your build. But if you must stick with the tko, call pro motion powertrain in Florida. They've built tko's that stand up to 800+ hp, sell a 'brace' for the case (which cracks in high torque applications), and will spec a clutch to reduce the shock the trans experiences which in turn will help the transmission last as long as possible.
-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course