er am i missing somthing if there was check valves (non return) on the vac line then the dizzy would either be sucked to full advance or would not advance at all? do you mean flame trap like you find on lots of ford carbs tt?
all you need terry is a thin vac line from any one of the manifold headers or behind throttle valve to the dizzy.
so the dizzy can react to manifold pressure
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