Sorry but most of us have to make a living and are limited in time we can spend. Not only that there are lots of different types of carbs. What you can do with one you cannot do with the other. To find someone that is an expert on all of them will be a real problem.

Now here is a little help. To lean out most carburetors requires either a jet and or a needle change. It is my experience that this works but will only give you gains in one range of engine demand unless you are very skilled. It also makes the car run like doggy doo without HHO or not at all. You can achieve a similar result without changing anything but just the right volume of HHO for the engine demand that you drive in most of the time and turn off the reactor in lower engine demands where you do not need it using a switch on the throttle linkage. A slight adjustment to timing might be needed. This way you will still have a vehicle that runs properly if the HHO is off without having to take your carburetor apart. Gains are between 15 and 30 percent and more in rare cases depending on the engine and a lot of other things.