Actually if I used bronze I would have My Machinist do the job on His Sunnen Hone (Not Inexpensive).
Personally, I would not consider the expense of having the kingpin bushes honed on a honing machine. There really is no point in such precision.
The problem that you have with the Morgan setup is that once in dynamic conditions, (actually in use rather than laid out on a workbench) is that all the forces when cornering and braking cause both the kingpin and stubaxle to deform (bend) once this happens, the suspension tries to lock up.
Precision engineering is not what's required. In reality, the clearance needs to be a tad loose relatively speaking, to allow it to work effectively. It is a common mistake for people to only consider suspension in static.
