Tony, are you sure that they are drip tubes? Mine is an earlier engine than yours and doesn't have them. It has a small hole through from the top surface of the tray and oily residues do slowly collect there from somewhere and then drip onto the cowling safely.
Both of those pipes look like they should have a flexible pipe attached. If they are drilled through and meet up in any way with the carburettor throat, uncapped I would expect them to mess up the running of the engine in any case. Is there possibly another sensor that these should be connected with?
I agree they both are shaped like they would have pipe on. I don’t think even Polish built 126’s were sophisticated enough to have some sort of mixture sensor on, as that is the only reason I could think of any type of sensor in that vicinity.
I don’t recall if the pipes go straight through to the inlet manifold but this link from AG suggests they do. https://webshop.fiat500126.com/en/katalog/artikelinfo/2773/bakelite-piece-_base_-for-carburetor
It’s odd because the engine bench tests fine with nothing attached to them. Well the proof of the pudding will be tomorrow as hopefully I should start it for the first time in the car. I’ll just make sure I have my fire extinguisher nearby.