Check out FTI torque converters for mopars. Either their site or Jegs carries them. Even ebay now has them. I got one for my 727 in 9.5 inch and 3400-3600 stall. They are efficient @ low speeds and are rated to 700+ horsepower I believe. Also anti ballooning standard! So its features are impressive. They are a little spendy @ $600+ but you get what you pay for! Ohh also they have 7/16 mounting pads for stronger fastener strength!
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