650hp Twin Turbo 355 HELP

I''ve got a problem. My 91 camaro has a twin turbo 355 with 650 horse. it had the standard borg warner t5 in it and after hot rodding it one too many times third gear went out. all the other gears work fine. i want to keep a 5spd in it but i want something that will stand up to the power. on top of hat the aluminum heads i''m gettin will give it close to 800 horse. any suggestions? a 5 or 6spd that will stand up

You want to keep a 5 spd? Nevermind, i was going to suggest powerglide.