Fuel Pressure
 

So I had found out a bit more about adjustable fuel pressure regulators but am still looking for applicable info for my car. There is that golden air:fuel ratio for performance but I cannot find too much on what I can do for my car. Its naturally aspirated but has had pretty big changes to the way it 'breathes'. Should I tweak the ratio to be a little more rich?
And also, what resources can help me learn more about all this? I search all over online but I'm not too aware of too many good websites.