CHOOSING THE RIGHT TORQUE CONVERTER

Keep in mind you have a torque monster according to the dyno spec sheet. And a pretty strong cam. I'd agree with those who recommended a stall of 2500-2800 rpm. Any higher and the torque will peak and the tires will fry and the trans will take a higher load.

I agree with buying a new flex plate. And indicate the 'wobble' near the converter bolts area. If the old transmission and converter worked, I might try it. Note that you must find out if the engine is internally or externally balanced before you order anything.