Haven't used them, but they would appear to move the bowls farther apart. You'd likely need to fab a new fuel line.
I tried an earlier setup that was similar: it replaced the metering blocks and had a needle & seat on the top that were adjustable something like 5 jet sizes. Ran them for a couple months on the racecar but jetting up/down wasn't really necessary in my case, so they've been wrapped back up & put away in my carb box for maybe 10 years.