Marcus,
I don't exactly have an answer since it's only possible to talk to a human at MSD if you have an extension. I did find this in the FAQ section:
What is the best Timing Curve for my car?
There is no real way for our Techs to answer this question but they can point you in the right direction. It takes testing and tuning time to find the best curve that fits your application. Many variables affect the ignition timing curve such as compression, cam specs, intake system, fuel, exhaust, altitude, driving habits and so on. The chart on page 3 lists some factors that will help you determine what sort of timing curve you should work towards for your specific application.
MSD’s mechanical advance mechanism is accurate and easy to adjust so you can try different combinations with the supplied springs and stop bushings. We also offer a variety of electronic timing controls so engines with locked out timing or crank triggers can take advantage of altering the timing as rpm changes.
Note: When you are testing different curves, listen for detonation (spark knock) which is a sign of over-advanced timing.
I suppose this means there is a may to customize the advance curve using their electronic timing control. I need to look into this further and see what additional info I can obtain.