From the factory they are driven in until the ends just barely stick above the material in the airhorn that holds them in place. It's really not a big deal and they will work fine if you drive them in a little further. It's one of the parts of the carburetor where exact precision really isn't required, at least from the testing I've done in that area. I'd also note here that the Ford 429 Cobra Jet carbs didn't use them at all.
Prior to writing my book I did extensive track and dyno testing and part of it included bleed tubes. I found that using a .036" bleed tube was a very good place to be with long tip secondary rods in the .040-.052" range. In really hot/humid weather at my altitude (about 1200' above sea level) I could got a tad leaner but started to experience some "surging" past .060" but no detonation or other negative symptoms.
Others may get completely different results. This often happens when you aren't using custom machined secondary rods all cut from the same cores with the same tip length, upper section size/taper and same included angle leading to the tips....FWIW........Cliff
