While we a BS'ing about ignitions & timing, I feel it should be noted that the numbers in my posts are from published sources - One being from Dyna's paperwork that comes with the ignition & the other from the OEM factory service manual.
That being said, it was brought to my attention by a good & reputable source, that if one were to make the fixtures needed & implement a timing light to verify actual ignition firing, that the Dyna has a tendancy to wander a bit & not fire exactly when the end user tells it to. And that through unbiased testing, the MSD has a more stable & accurate corellation between intended & actual ignition discharge.
I have yet to verify this myself, but do believe this to be a good probability... either way, I thought it was good info to pass along.