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I have the vortex with dual Zenith B carbs. In my experience synching was not a big deal, you just have to get the idle stops to match. I made no changes to the jet sizes.
My butt dyno says there is an increase in power. The only downside I found was it tends to be a bit cold blooded at startup so I need to get the engine warmed up before setting off, but it is great when up to temp.