torque boxes

Old thread but here goes.
So is it safe to say that a 70 Duster 340 car with torque boxes was born with a 4 speed? I say this because I am looking to buy a car which I am not 100% certain if it is a factory 4 speed car but it does have torque boxes which appear original. My understanding is that auto and 4 speed firewalls are identical and duster floors were factory cut on 4 speeds. Thanks

IMG_5546.jpeg

IMG_5536.jpeg

IMG_5528.jpeg