[Jay Laifman]

Thanks. The question though is really, is this abbreviated advance curve showing that something is wrong with the distributor, so that I don't have the right advance at the right rpm. And maybe that's leading to my CIS not functioning correctly?

The driving issue is that at light throttle, it's a bit jittery, not terrible, just not perfectly smooth. And to get the rich/lean adjusted to be as smooth as I can, it causes the idle to be richer than should be. I've explored all other aspects of the CIS and I'm now looking for other possible culprits.

And note above, I had a typo in the ATDC, that is fixed now.