Set your base timing at idle speed. Warm that motor up until the thermostat is open. Choke (if fitted) should be fully off. If it's automatic choked, make sure the choke's open all the way. Remove the air cleaner assembly.
Adjust the hot idle screw (or idle screw if it has a manual choke) until the idle speed is dead on textbook. Think it's 525RPM with a manual trans. When doing all this, have the radio operating, and the headlights on high beam, and the demister fan blowing.
These are important because electrical demand slows down the motor by increased generator load, and your "worst case scenario" would be not having enough idle RPM on a cold rainy night...
Double check that base timing again. If it's correct then you move onto the mixture. Screw the needle in until the RPMs increase, kep going until they start to decrease. Get back to the last steady point and adjust your idle screw again.
You will find it's several iterations of this exercise; screw in the mixture needle until the idle falters, back out a touch for stable idle, then adjust the idle speed screw... Eventually it will be balanced. Now with the motor running, refit the air cleaner assembly. A measurable rise of RPM means your filter is obstructing flow significantly.
Shut off the electrical accessories and idle will jump a little. That's what you want.
Cheers, Adam.