Dee I'm tellin' ya, really LOOK at the top gasket. It's easy to get upside down. Impossible to put on backwards but easy upside down. Flip the top cover over, place the gasket and you'll see what I mean.
There's only a few ways that it will idle with the screws all the way in.
1) misinstalled cover gasket as I've mentioned.
2) sunk or misadjusted floats
3) throttle plates, primary OR secondary, open too far at idle.
I've seen #3 as a problem before on a friends carb. The set screw was adjusted too far in which opened the secondary plates too far which then caused enough vacuum to suck gas through the unchecked secondary nozzles. But it's not common for folks to mess around with that adjustment so not as common as a flipped top gasket :)
Good luck and happy hunting!
Cliff
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HAVE A NICE DAY!!!!