It's been more than 30 years since the auto industry transitioned from carburetors to electronically controlled fuel injection ... as the Motorcraft 2150, which featured a variable air-bleed ...

The easy way to tell a 2100 from a 2150 is the rear edge of the base of the carb. Supposedly, the 2100s have a rounded rear edge like this. See All 27 Photos And a 2150 will have a flat rear edge ...