Vacuum advance can adjustment

I've changed the jets on the carb but waiting til I get timing set before completely tuning it. If I set 16 initial/36 total, it runs fine. But it idles better -- and has more vacuum obviously -- at 24 initial. Like I said before, the motor likes a lot of initial. When I had my old cam, I once timed motor by ear using a vacuum gauge. I got smoothest idle and highest vacuum and I looked and was at 40 initial. That wouldn't work. I'd like to run vacuum advance, but if I cant it's no big deal. As for my recent post, how do I adjust can based on my timing reading when I use mityvac on advance? Do I check timing at 2,600? Thanks
Sorry yes you can use the mighty vac at idle if you want just have to know where the mechanical is at 2600 and add the vac to it.