ok. im new to gm autos. im going to be putting a th400 in my car, with a 3200rpm stall and i did search, but havent been able to find what i need to know. figured there should be some pretty knowledgable people here. anyhow. i want to rebuild the trans before i put it in and need it to hold a fair amount of power. i plan to put at least 600tq through it and was wondering what all needs done. i found these kits on summit that include new clutches, steeles, shiftkits, etc...

hughes

tci

b&m

im just not sure what else would need to be replaced, and also, which of these kits would you recomend. also, any pointers on the rebuild or what to be extra carefull with, otr ay special tweaks to help it hold more power etc.. i plan on using and external filter kit and a large trans cooler to keep the fluid clean and cool. anyway, enough rambling i guess. on wit hthe comments, suggestions etc... thanks in advance.
william