318 poly w/ carter AFB rough running especially idle and off-idle.

With a picture of the carb, I can see that you don't have the vacuum advance hooked up. This can cause a stumble on acceleration, but doesn't effect idle. Looking at the carb in the picture, the vacuum advance should be plugged into your plugged port to the left, just above the butterfly ( no vacuum at idle). A side note on your idle adjustment- do both idle screws behave the same? Screwing them in to the point where the engine stumbles- this is normal. Do they both do the same? Or does one side adjust different than the other?