Reading Spark Plugs

I wanted to give an update and thank everyone again.
My friend rebuilt the 600 carbs, put in new plugs, and tuned it up.
It runs so much better, throttle response it better, it's a different car. The tunnel ram hesitation is, different, not better or worse, and nothing that affects drivability or is even noticeable to passengers.
It feels like if they were not vacuum secondary carbs it would run even better, at least more ridiculous.
It felt like I was stopping for gas more often at first, but now not so much.
Plugs still look good and the horrible exhaust smell is completely gone.
The electric chokes were swapped from the 390s, they worked fine when I picked it up, and he had it for a few days to sort everything out, however they haven't worked since. I only checked for power to them, nothing else. It's been very warm and a non-issue to date, but I will address it.
I would like to try it with mechanical secondary carbs, just to see how it drives, but it's not on my list of things to do right now.
I am happy to say, tunnel rams work very well on the street, and I drive this car daily - I mean as a daily driver everywhere I go, if it isn't pouring rain when I leave in the morning I take it.
Thank you again FABO!