Which torque converter?

[GreenMystChevy]

Well after destroying two torque converters in my Chevelle I figured I better go buy myself one that doesn't crap out on me every year. I have never quite understood the importance of a good converter until I have destroyed a couple of em.

-My question is which torque converter should I get for my car? Brand, stall, etc.-

It is a stock rebuilt 1970 402/350hp backed by a TH-400. I drive the car a little harder than I should sometimes but I try and keep everything in good working order and plan on keeping it till I'm old so I am looking for a converter that will last quite a while.

I know that I am going to have to break down and buy a fairly expensive one because you get what you pay for. I also plan on getting a new flexplate and installing a shift kit while I'm at it.
Are these engines internally or externally balanced?

What are your opinions on the flexplate and shift kit, what are some good ones to get?

Thanks guys