Well, the shifter part of the tailshaft is a lot taller than an A833 and clearly at least the lower mount will be a lot different. I would personally expect that the upper part of the crossmember would need to be removed and replaced with something else, and at that point you're probably just better off doing the T56 Magnum, its only slightly more expensive and works extremely well and you know it will be supported in one way or another for an extremely long time due to being a relative of the TR6060 camaro/challenger transmission.
I did the T56 Magnum conversion from a 4-speed and covered basically everything: T56 Magnum Conversion
It's absolutely wonderful, really makes the car a pleasure to cruise around in at any speed and shifts great.
