In general, with a MSD it is a much hotter spark and it does help the car to make sure it does not missfire at not only high RPM's but during difficult conditions, like high compression, huge cams etc. You in most cases depends on engine combo limit RPM as to not over rev, start with more base timing like 15-20 and limit total to 32-36 and get the timing to kick in at a low rpm like 1800 and all in at 2800 or so.
Those are just a few of the areas of an MSD setup. They are a more accurate system. Now they make an all in one unit that includes the module i nthe distributor similar to a late GM type, and then you have the systems with external modules al6 , 7s etc. Depends on what they are used for.
Most modern cars IE EFI like a late model 6.1 hemi, a GM for example etc use a form this ignition which is called capacitive disscharge, hoter, longer, wider spark. Again main purpose is to make sure the plug ignites the air/fuel mix under any load condition.
What all are you looking to do with your ride and what is your setup is the ??
