The book calls for .010 on both exhaust and intake valves. I always set them to .012.
The top screw on you carb in idle only. You work with that adjustment with the stop screw on the throttle plate arm to get the slowest idle. Above idle that screw has nothing to do in how it runs. After the idle is set you then set the engine to high idle or wide open. You then adjust the power jet adjusting screw to the highest RPM and turn the screw back in until the engine starts to slow. If it still runs black smoke, turn it in a little more. Most B's do not have an adjusting screw for the power jet.