Carbon in secondary ports

[mmkkpro]

Hi guys, hope everyone is well, I haven't posted in a while, I an a foreman on a commercial block/Brick crew and we are slammed.
Anyhow, car is running, seemed to have a slight miss off idle, I used a spark tester to check the spark and number 7 and 4 were yellow spark and seemed intermittent. So I have just got done installing new coils and wires as it still had original parts on the car. By the way ACDelco part ACD#628D is the plug set I bought and only one wire was exact length all the rest were too long or too short. I probably should have checked with you guys first. Anyhow back to my guestion.
Carbon build up in secondary ports and on the blades. Will it burn off? Can I use CRC intake and valve cleaner? Should I just disassemble everything and manually clean it, if the ports look like this,what does the valv look like? It looks like to me the secondaries were never used before I got the car, or used very little. Also I'm leaning towards a delete of this apperatice.
Tieing secondary plates open? Advantages? Disadvantages? I have driven this car and they don't seem to be working, and I have done all tests outlined by FSM and Marc H. I know there are a multitude of parameters it has to meet before the computer will let it work. Sorry for all the questions, I been a drag racer forever and am a carburetor guy, but in learning. Thanks