You really don't need to fill out a tech sheet for this application. Just have the converter built as tight as possible. With over 4,000lbs, 3.23 gears, 600+ lbs of torque, and street driven, you can't get it too tight with the 10" converter cores available.

Now, if it were a track car trying to hit the number, it would be a different story. But being primarily a street car, it won't be too tight. In fact, I would be surprised if you can get a converter that would flash below 4,000 with that combo and a little traction. I haven't been able to.