Peter, undo the lock wire on the bolts and that part of the UJ falls away, and then there should be a bolt in the centre of the output shaft to undo and then this half should pull away. The lug that has been cut down on the gearbox top is probably so the sheet metal gearbox cover can clear as the sides of this taper to the width of the gearbox when in place.
The Ford boxes can have many different configurations, with regards to what side a handbrake is mounted, whether it has one at all, whether it is British manufacture or American , with regards to any lugs protruding, Cheers Andrew.