Well, I finally figured out why my non-cc qjet would stick on a higher idle occasionally, and i'd have to blip the throttle, or pry the throttle shaft back towards the idle screw, so I thought i'd share my newfound knowledge. I'll start by listing off things I tried (and for that matter, what one would try first to eliminate such a problem)

When the car is stuck at a high idle, check:

-The fast idle cam, it should be "down", and the choke butterfly should be open. If not, push the fast idle cam down, idle should drop

-check if the throttle tang is resting on the idle screw(drivers side)
- if it's resting on the screw... back it out!
- if not, it's binding, usually on the choke, however !!!

you could have a binding throttle shaft (needs bushings), or in my case ->
The secondary butterflies are set to open as the throttle is open a certain amount, this is adjusted by bending tangs here and there (check your rebuild kit, it gives instructions), as well as WHEN THE SECONDARIES CLOSE!!!. ahem, so if your secondary closing stop isn't bent correctly, after opening the secondaries there will not be much force left to bring them shut, hence they may hang open a TINY bit. (A tiny bit with bores that big is 200-800RPM, quite noticeable...)
So, bend those tangs correctly!
I think mine originated from when I first picked up the carb, and I turned the throttle shaft, the secondaries wouldn't open
so I reefed on it (essentially bending the tang...), then realized there is a secondary lockout lever

SO! Don't do that. Make sure there is the correct gaps on the secondary rods, if you don't know what i'm talking about, I can scan the instructions for adjusting this.

Now my car idles quite happily at 600RPM, without sticking up on 1400RPM at all! Hopefully this isn't a fluke.

Anyway, that's my mad ramblings, I hope this helps. -J

 

Just to add another thing to look for incase someone finds this in a search down the road. I had a Q-Jet a year ago that I put on in place of my Edelbrock that idled too high and I had a heck of a time figuring out why. I had the idle speed screw out all the way and it was still at 1000 rpm in gear. I was thinking maybe I had a bad throttle body. Replaced it, but still the same crap. Then I wondered if it was the incorrect rebuild kit or something. Anyway, I found out that my stock throttle cable couldn't quite reach far enough so it was actually holding the throttle open ever so slightly. New bracket solved it in the end.