Rochester 2 Jet filter assembly. Here is an illustration showing how the filter is installed on the 2G, 2GC, 2GV carburetors. This may not be true on the late 70’s carburetors.
#16 is the return spring.
#15 fuel filter. Usually bronze type.
#14 is a small gasket about the size of the filter and is used to keep the fuel from leaking around the filter.
#13 is the fuel inlet gasket and there are a couple of sizes to choose from.
Watch a video about the fuel filter: