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What the factory did for the 35mm H1R, H2R and larger KR750 carbs was to employ a two piece setup to link all 3 carbs together.
At the lower end of the carbs, there was a steel plate that attached across all 3 carbs by the float bowl screws.
At the top end of the carbs, just above the air filter mounting boss, was a cut away that looked like a "C". A long shaft, threaded on both ends, with aluminum spacers between the carb bodies, sitting over the shaft, and a nice pair of clamping nuts, one on each end, held the tops of the carbs.
We found using just one of the devices caused no significant help in stopping carb movement from engine vibration, but, both in place, helped significantly. Mounting the whole deal was a bit of a job if you had never done one before, as you started with the carbs and brackets done up, then, the clamps and intake manifolds on them, loosely, then, manifolds to the cylinders, which were mounted to the engine. once the manifolds were on the studs for them on the intake ports, the manifolds were tightened in place, clamps tightened, and the whole business was good to go.
I am a big believer in dowel pins to align things, and all my engines had dowel pins for things like cylinders to cases, so everything went on in the same place it came off, as there is too much "slop" in things like cylinder studs to cylinder stud holes, cylinder heads to cylinders, etc. This practice was used more extensively in later 4 stroke engines, and we had thin wall hollow studs that fit over the studs. It helped get stuff placed and kept in place, and isn't all that hard to do.
Once the carbs were basically set up as one unit via the devices, the carbs worked a lot better.
On the hollow dowels, I do a lot of setup on things like tri-power car intake systems, that use physical linkages on the carbs. As there is slop in all carb base holess to studs, I do the hollow dowels to those carbs. Makes it a heck of a lot easier to remove just one carb to work on it, and get it back in the same place on the manifold, so you don't have to mess with the linkages between the carbs for a half hour getting them back in the same place they were before the carb(s) came off.
Just info to consider.
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