Domingo is correct. This is an entirely new case. We have designed it though to retain all the critical dimensions necessary to not require modifications to the car.
We will take the A-833 cores because we will still continue to do 4 speed stuff as well. We have no intention on stopping that. As for a shifter, this will be an external shifter. Same arrangement as your original factory piece. Obviously internally different due to the need for 5th gear. However, we plan on building these with the appropriate tower to accept a press in shifter handle as well as a bolt handle. The customer will make this decision when they order the trans. The Stage 1 trans will be able to handle close to 600 lb/ft of torque CONTINUOUS. Of course, more than that in bursts. With the Stage 2 unit, 600 lb/ft of torque CONTINUOUS will not be a problem at all.