Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

Okay the misfire thing actually makes sense. I watched a video from thunderhead289 yesterday about setting idle mixture, and he said to set it to the FIRST point of highest vacuum, meaning set the plugs out about 1.5 turns, and turn them until they read the peak vacuum the first time. Then back out a bit. The idle smells rich, that’s why I’m thinking it’s rich but I get I’m not used to not having cats lol.

I know this truck can run 16:1 with the ignition setup I have when it’s cruising flat. I’m watching the vacuum gauge and listening to when it sounds like it’s starting to sputter in a low gear at cruise speed which ends up being right around 10.5, but I think with the right TSR and PV tuning I can make that work and maintain my lean cruise at flat ground.

Should I read the plugs for idle or is that really something that never works because every engine wants something different to idle?