The accelerator arm return spring gets connected to the exhuast pipe flange you see in your picture. In mine, there is a hole near the edge of it where the end of the spring hooks into. For a 200 engine with an automatic transmission, the carb has 2 dashpots, and only 1 dashpot for manual transmission applications. The carb with the 2 dashpots will also work well with the manual transmission as well however. The threaded inlet near the bottom of the carb, there has NEVER been anything connected to it for my Mustang ('66 200 engine, manual transmission) and I've owned it since 1976 when my father gave it to me in college.