I find my 3 is hunting with more play than I like at speed. It is not comfortable especially with the over-steer that it already has. I am not closed to going through the existing steering, in fact I haven't really even looked at it for years. But already being there to replace the radiator, installing the rack is almost done anyway.
The rack for the TR3 is not the quick rack so I'm not too worried about that, nor the control head so much. I hadn't heard however, that it increases the steering ratio. That I'm not liking.