What are these fittings for? They're the little barb fitting with fuel line connected. In the pics here there are two with the fuel line on them and then two tiny holes that are threaded that previously had the same small barb fittings except they were straight and not 90 degree elbows. I gave my engine to a repair shop with 4 fittings here and they used my core and gave me a new block that only had two and the two that are missing are threaded holes. I cant seem to find info on what exactly they do and if i can just plug the threaded holes with pipe plugs and call it a day. 
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