Timing setting help please - 1969 w115/220 gas 4 cylinder

[Topher39]

Could use some basic guidance on setting the timing on my 220 - I have a timing light and dwell/rpm meter, I need some clarity on setting the timing as it relates to settings/rpm and vacuume hose on or off. The car is running and at the moment I have the timing set to facilitate the smoothest idle. Idle is a bit high at the moment, again to get a smooth idle and decent warm up. The car runs well, it's a standard shift. I do get some dieseling when I shut down, I am thinking the timing may be a bit off, running a bit hot perhaps?

When I take off the vacuum hose while at idle, I do see a difference in rpm and idle - is this normal?

Some numbers and "sage" advice would be appreciated.

Chris