If you are going to stick with the Motorcraft 2100/2150, keep it! Take it out, clean it, put it back in with a new gasket. You should have a metallic tube coming off your choke element that goes to one side of it and the other side goes up to the top of the carb to get clean air (but that side is not all that important).
The heated air that comes through there, along with the electric choke element work together to open your choke faster.
If you do not have the tube coming off your carb, go to any McParts and ask for a "Choke Stove Kit" and it will come with the bits and pieces to hook it up. Should be well under $10 and it really helps with the way your engine warms up.
I was looking for some good pictures and came across this link with good info and fuzzy photobucket pictures.
79 Cherokee Chief, barely runs
(Cherokee Build Thread)
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