So ten inches would be ok?
He said "minimum" so that would not be a good goal to shoot for. At idle you want it right where you have it, or higher if you can get it there without causing other mischief.
I could use a little less idle.
As ugly74 said, you adjust the other stuff, then reset the idle with the idle speed screw. Then you set the idle mixture screws and reset the idle with the idle speed screw. Then you set the timing (again) if needed and reset the idle with the speed screw.
Basically you don't set the idle with the other parameters. You make the other adjustments to where they should be, then match the idle to everything else using the single screw.
Any time you advance timing, you usually gain idle speed, and vise versa.
Setting the idle-air mixture screws and then the idle speed is a little dance that you have to do. One thing changes the other, then you go back and reset the other. Do that in little steps until they all sit where you want them.
And the automatic choke on the side? If its a little hard starting can I adjust it with that
Not the idle speed, but yes, you can sometimes help a hard-starting engine with proper choke adjustments. But there are certain ranges of "correct" here too, and hard starting is not always the choke. It can't hurt to test that theory, but don't overlook ignition timing, point and condenser condition (unless electronic ignition is used?) and spark plug condition. Every one of those will have an effect on starting. Cold and hot.
Good luck.
Oh, and what year is your Bronco?
Paul