It definitely is possible, and my experience is with a R154 so a lot less space to deal with.
The easiest way I found was loosening off the engine mount bolts so the engine could rock and then lowering the trans slightly to give you better access - and doing this may require some extensions and/or some form of swivel joint to get to the top bolts.
Word of warning though that once the trans is disconnected, then engine may want to tilt forward (its been a while so I cant remember by how much) so either have a helper keeping an eye on it or stick a piece of wood to protect the front of the engine/back of the radiator.
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