Wow... the prices of TC are wild.....
Please check out Edge Racing Converters... they are custom built at a fair price
https://edgeracingconverters.com/pro...gory/gm/th400/
I have there 9.5" Street Edge Behind a 434 BBC w/ 530 TQ works great
I also have a TRISHIELD behind a 350 Buick but there are more money... I think the stall is a tad high, but it does work very good also.
Its best to talk to a builder of converters,,,,, just to many variables