I agree his answer sounds very strange.
I know its not answering your question, my distributor is stamped with a spec of an advance of 25 at 4,000 RPM.
I had 12+ degrees of advance at idle which led to a very high advance at high revs. I recently dialed it back to about 8 at idle. The car now runs more smoothly, although with less mid range.
I think there is a big difference in settings depending on what type of head you have (unleaded vs. leaded)