If you have questions as to whether your current converter is optimum for your combo speak to Charlie Plott at ATI.
Be prepared to provide him with factual data, including but not limited to what does the converter flash to on launch, what RPM does it fall back to on the gear change(s) and what RPM is it crossing the stripe at and the only way you'll know this is with a playback tach or data logger.
As to my car's specs...
522 BBC, turbo400, 4.57 gear.
Slowed to run low 9.0's all season long at near 150
More importantly what are the specs of your car/combo?