Emeraldeyes,
Unfortunately there's a feedback loop with ACE inhibitors that results in MORE sensitivity to salt. That's why they are almost always prescribed with a diuretic.
So yes, if you are going to take only an ACEI, then cutting salt WAY back is a very good idea for best BP control.
But, as Canyondweller says, NEVER use salt substitutes.
If you can't cut back to something liike <2000 mg./day then adding a diuretic will solve the sodium problem.