On mine, I just got the cheapest ~2,500rpm stall converter I could find on Amazon or Ebay, but with the low torque of a six it won't stall that high (compared to an average V8 for which the rating is based on). Near as I can tell it works perfectly normal with my combination.
You may want to consider looking at mounting the TV cable to the firewall and gas pedal directly, then you can move the carb any which way you want and just worry about the throttle cable. To put it on the firewall you will need a pressure gauge on the transmission to make sure you have the right TV cable adjustment (a gauge is even recommended for a normal setup..). I'd get a universal adjustable cable or a long cable for a TPI engine or such.
