what slot box are you looking at installing?
if your staying "rover", the r380 will bolt right up. but obviously,you will need all the ancillaries to complete it. pedal assembly, flywheel, clutch assembly etc...
also if i'm not mistaken, the output shaft on the transfercase may need to be changes to a shorter or longer style, can't remember which at the moment.
seems to me, it would be easier to get a disco with the stick.
they are not as common but they are out there.
oh, and Bri, you'll never be able to convince a stick guy that an auto is better. they take that shit real personal!
i personally would never go back to a manual box, but i like to "wheel" with one hand on the steering wheel, and the other hand wrapped around a Latte.