Kickdown Carb Rod

If it was a factory 340 car, it should be correct IF it has the right lever on the valve body.. Please measure it from its pivot to the center when the rod drops in it. That will tell you if it still has the 4 barrel one or a 2 barrel one.
Okay and if that checks out, am I correct in saying I need the piece I have circled, in addition to the holley extension?