Super tuning car runs good shooting for great

That's a pretty wicked idle!!
As to the alternator, yeah that's one of the reasons why I stick with the Mopar stuff;unplugability. In your case you will have to divorce the alternator completely, to see what the ignition does.But I'm sure you already knew that,lol. Another reason is, I just like the looks of the SQ back units. But mostly, I like the idea that if my regulator were to ever fail (and it did once, driving the alt. to 19volts), I can just unplug it and keep on driving. Then hook it back up for a bit to recharge the battery, and then repeat as often as necessary to get home. My alternators seem to last forever with nothing more than bearings and brushes. I think the last one I actually bought may have been in about 1973; I was 20 and didn't know much about anything.I have rebearinged several, and some several times.And yes occasionally I have had to replace a diode or a diode-trio. And I've had an armature quit too. But I have a large box of salvaged alternators with parts to draw from,lol. Same with old-style starters; but I'll probably never use one of those again, as the minis do a waaay better job.
In any case I hope you find and solve your timing issue(s).
Again,Sweet sounding idle! If it pulls a sweetly as it idles, she'll be fun alright!!