The blades both front and rear should show the transfer slot as a rectangle. That would be the initial setup. You could use a vaccum gauge and adjust the idle circuit to get the most vaccum. Sometimes its not easy to hear when the motor idles with good afr.
Off course you want all screws equal turned.
You whant the highest vaccum reading at about 1,5 turns out from seated.
If its far off at 1,5 turns you would want to increase idle air bleed size.
How does it run when just off idle before the mains start?
What kind of carb and metering plates?
replaceble air bleeds?