[Daves55Sedan]

The tube running inside the manifold MUST be continuous and without flaws (corrosion, holes, etc). If the tube is compromised, the surrounding vacuum will suck vacuum through any hole in the tube and negate the purpose (which is to transfer heat from the intake heat-riser passage up to the auto-choke spring housing).

That BOLT inserted at the end of the tube on that side of the intake may have damaged the inside of the tube such that the new brass fitting cannot be fitted tightly into the tube anymore. If they force-threaded or tapped threads into that tube for the bolt, I would be concerned, but if you can get the brass fitting fitted tightly into the tube, there might only be a very small leak (of heat) out the end of the thread, which might be okay. The main thing is, the brass fitting must fit tight in the tube and not fall out.