Hello. I’ve got a 70 duster which someone converted to manual before I bought it. I have not owned the car very long and decided to upgrade the motor. Recently I turned the 318 into a 390 stroker and the stock used clutch was not up to the task. I just pulled the trans to change the Clutch and realized the aluminum A833 trans is likely an overdrive unit which is not what I want as I plan to drive the car hard and do some drag racing with it. I’m assuming I can keep the bell housing, Clutch fork, z bar, shifter, etc and I just need to find a regular 23 spline A833 (I’m assuming in a steel case). So long as it has the shorter a body tailhousing. Will something like that be capable of holding 400+hp at the drag strip? Any Tips on what I should be looking for and other upgrades I should do while I hunt for a trans. for now I’ll finish my clutch swap and take it easy on the aluminum overdrive unit. Thanks for the help.