If you don't have a service manual, you can look the float height up for that year, make, model on the interwebs. You can also find the correct procedure as well. That carb tuning thread will be your best friend once you get them rebuilt, and are on to fine tuning them.
Year make and model are important. The carbs mount on a slight angle and are rotated a varying degrees given the design of the engine and frame assemblies. This rotation of the carbs will necessitate a change in float height for each specific model or application. The clear tube method may be most efficient if you can't find specs for your application.
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