Can you please define "0 degree spec nozzle?" I have only ever seen one specification for the IDI injectors for these motors.
On another note, I wonder if the differences in precombustion chambers corresponds to a difference in the valve styles? Does that Ford head have valves that sit flush to the head, or that protrude slightly from it? I don't recall when Mitsubishi made the switch. Then again it may just be a change that they slipped in when it was convenient.