Steering boxes aren't the best... They do seem to wear up to a point, probably because they've got more bits to wear out than a rack and pinion does.
There's always that vagueness associated with a car that has a steering box - sometimes it feels like you're steering a boat. Though having said that, sometimes when you turn the wheel the car doesn't always go in the required direction..
Steering boxes are low-geared and lack the 'preciseness' of rack and pinion. They were ideal before rack and pinion and power steering came along .. well .. they had to be .. there was nothing else. You'll soon get used to the handling. An inch of play is nothing ...