Does your ignition need to be improved? DurasparkII distributor run to either a Duraspark box or Mopar Chrome (my preference) box will give you a solid electronic ignition that's more reliable and less costly. As far as I'm concerned, MSD = "Must Spend Dollars". Might be worthwhile on a radical build where you actually NEED multiple sparks and/or boost retard, etc., but not in a "conventional" street build.
Of course, do what you want, but I hate to see folks spend money and get a poor return on their "investment".