If your vacuum advance is affecting your idle, it's set up wrong.

There should be no vac advance at idle. Even on a rock stock motor, there is no vacuum on the ported line at idle.
That's one of the reasons why they aren't on manifold from the factory too(so it isn't on at idle), and why articles like the one posted, aren't as accurate as thier writers think they are.

And yes, I also thought John Hinckly was the guy who shot Reagan. Is he even out of prison yet?