The easy way to tell a 2100 from a 2150 is the rear edge of the base ... eventually we switched to the correct short venturi cluster retention screw—whoops. We are human after all.

The Autolite two-barrel was ubiquitous on Ford engines throughout the '60s and early '70s, and its essential design carried on into the '80s as the Motorcraft 2150, which featured a variable air ...