You need to adjust the choke coil and choke-fast idle speed.
On a warm engine, set the high idle cam on the second notch. (this is the swinging cam on the throttle shaft closest to the carb body). Adjust the idle speed with the inner adjusting screw to 1600 rpms +/- 100 rpms.
Now, you have to wait till the engine is stone cold to set the choke coil. The carb rebuild kits have the spec to get close, but I usually start withe the choke closing the choke plate to about 3/16" from full closed. (you have to operate the throttle linkage once to engage the choke). The coil is adjusted by loosening the 3 screws holding the cover, and turning the choke cap the desired direction to open or close the choke as needed.
The engine should start easily when cold, and have a fast idle. As soon as it stabilizes, pump the gas pedal once to let the choke pull-off drop the idle to a reasonable level (around 1,100 to 1,200 usually unless it is below 40 degrees).
Now once the engine gets to operating temp, set the idle speed to about 750 rpms.
Next, try fine tuning the idle screws. Turn each in till they just bottom, then back out 1.5 turns each. Using a vacuum gauge, slowly adjust each screw (1/4 turn at a time) for maximum vacuum reading on the gauge. Make sure the screws are within 1/2 (or less) turns from each other.
You may have to re-adjust curb idle again to 750, and the fast idle (2nd notch on cam) again.
Timing should be 8 to 9 degrees BTDC (vac line plugged going to dizzy). If you have to readjust timing, you will probably have to tweak the idle speeds again, timing and mixture each affect idle speed.
You can check the vacuum advance setting while you are under the hood. With engine off, take a 1/8 inch hex wrench and turn the screw in the snout of the vac can in till it bottoms, make sure you count the revolutions. Should be 7 to 8 full turns, if not, set to 7 turns out from bottom (write this down so you don't forget).
Hook everything back up and go for a ride and see how she does.
418 miles on 19 gallons of gas. Can't beat the BBD !