I'm having Kris at
Continental Converters build me a custom converter. I've already been in touch with them, but they are out of the particular core that they need to build me one. I've got a Parts Wanted thread started and think that I have a lead on one.
Here is an on-line article that Hot Rod did on Continental. It's pretty interesting.
http://www.hotrod.com/how-to/engine/high-performance-torque-converters-by-continental/