In-gear idle issues

That's a ton of advance for what seems like a very mild engine. Also, a few things. Are you 100% SURE you have the plug wire probe on the correct plug wire? Secondly, LOOK closely at the plug wire probe clamp. Sometimes they have an arrow that designates what direction to clamp them on. The arrow should point towards the plug if it has one. Lastly, I see the light doesn't not flash uniformly, so it cannot be giving you an accurate reading. This tells me a few possible things. Either you have a bad connection "somewhere" with the timing light, you have some rf interference with some other wires going on with the plug wires or you have a problem with the ECU box. That looks like one of those dirt cheap orange ECU boxes Mancini sells. They come from other places too, but if that's what it is, they are known for not being good......and that's putting it nicely. lol As a form of good practice though, before I changed anything, I would go over all connections and grounds and make sure they are CLEAN and TIGHT. One more note. You have a LOT of loose and disheveled wiring under that hood. You need to clean that up as that in itself could be some of the rf interference I was talking about. Probably not, but you never know.