This is the stock intake bolted up to the Nibbi flange finger tight.
The original studs are just barely long enough that they should work. If you would like the stud to be longer, you would have to find a stud that is no more than 3mm longer than the original one though. The reason why simply has to do with the body of the carb where the enrichment plunger is housed will make contact otherwise.
The other option would be to switch to bolts.
In either case, the side pictured needs to be started first so that you can get the nut over the threads to start it. If you try to do it the other way around you can't clear the nut past the body of the carb for the same reason the longer stud can only be 3mm longer. Simply not enough room.
I am going to run the original studs and nuts with some thread locker on them and treat the intake and carb as one complete assembly. Since the space is so tight on that plunger side anyway it would be even more annoying to try and remove the carb that way. The intake bolts are much easier to access.