Given the stock G3 cam is tame by nature, I'd imagine the idle timing advance isn't that "busy". I have a 112 CL cam and take some of the lope out at idle with timing. It's very easy to do. There's a timing table plotting intake vaccum and RPM. When RPM goes up, knock timing out of it. When RPM goes down, add some advance. If you were to see a log of my timing at idle, it's all over the place.
