Swapped out the converters this afternoon and drove the car around, got on it a bit and the engine temp was about 7* cooler with the 2400 TC than with the 3200 TC. No other changes. Nuf said.

Yeah, we dynoed the motor after the build and got 613 lb/ft of torque and 510 HP. The max torque cam in at 3400 rpm and the hp came in at about 5300 rpm. So you are correct, I really don't need a high stall converter for this combination.

Thanks for all your replies.