The '73 2100 IS a 2100 and all 2100s and 2150s FIT your intake. All 2100s made after 1971 are Motorcrafts and have Motorcraft cast on the top cover. That includes the '73s that are obviously what you have. The nitrophyl floats do occasionally absorb gasoline. But that's rare. Usually the flooding is either dirt in the needle valve or a fuel level set too high. The relative buoyancy of one float vs. another is irreverent if the fuel level is set to spec. The float level is just a preliminary adjustment. The float spring referenced in post #3 makes the float sit a little higher but most 2100s, 2150s, and 4100s don't have that spring, and work well in spite of it. If you take the top off your 2100 while the engine is running, you can see if fuel is over filling the bowl and set the fuel level to spec. stopping that. Rebuilding kits include that spec. in the instructions. The nitrophyl floats are lighter than the brass floats so I find them desirable.
