My engines liked the secondary air valve to come in quick and I did not run a vacuum pull off.
I was told by my uncle it would be quicker with it.
I let him hook it back up and tune it and after a couple hours he tossed in the towel and said my engine was odd and sure enough it liked it to come in soon as possible.
Now one little mod I like to do is not really anything special but it helps the secondary air door transition smoother.
That little rod with the spring on it that you can see when you turn the carb upside down.
That little rod will many times get a very "small worn notch" in it from the spring sitting in the same place for decades.
The tiny hole just above the leading edge of the air valve can be plugged and redrilled just BELOW the air valve to allow quicker response from the secondaries. It functions as a sort of passive "accelerator pump". Some factory carbs came this way.
I have several Qjets tucked away if anyone is interested. 2 would need to be rebuilt and one was rebuilt by a high end guy 20 years ago ( I can't remember the shop but at the time he was "the guy", I believe it was a "stage 2" rebuild but I never ended up running it on the car becasue the local guy I was using to help me set up my motor was more familair with the Edelbrock carb. After frustration with that I then went to a Holley 650 but found living in a colder it wasn't to my liking. I regret not sticking with the Q-jet...I switched over to a Holley Sniper now.