You can also use the idle ports to set the throttle plates in reference to. It's pretty much as close as the bread tie, and doesn't need the bread tie (the bread I buy uses those plastic clips anyways
. It's actually recommended in the factory service manual for my XS400 for the bench sync for the carbs prior to installing the carb bank and doing a vacuum sync, seems it's just as valid for ours given they are the same model carbs, just 4 of them instead of 2 and with different jets and vacuum slide spring rates (and I think the needle and emulsion tubes are different too, but the carb bodies are the same).

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