ive done it both ways and find it a lot easier to split the box and engine, for the sake of not even 10 bell housing bolts made my life a lot easier, problem i foudn with lifting box and engine out together was space as it passed the brake servo. as youve got a crane id undo exhaust hoses etc undo the ring of bolts, take starter out lever engine aside then lift up. oh but if doing it that way it will make your life easier to loosen the geabox mount nuts front and rear to give the gearbox a bit more movement.