What TC do I need????

I'll be installing a 380HP-360mag. into my 71 Scamp this fall with a 904 behind it and I need to know just what stall TC I need for it. I already have the correct weighted flex-plate for it. I have been told that the orginal TC that's in it will work just fine providing I remove the weights. The car is an orginal 318 LA,904, 8 3/4 car. Thanks for any help guys.

Jim