Hey Jeremy. There is another thread from not long ago (a week or so maybe?) that has good images of the stock throttle linkage hooked up.
If I'm not mistaken, the rod in your hand is attached to the throttle bellcrank just behind it on the firewall (which is attached to the pedal by a short rod too).
To the left in the pic (inboard) the other half of that linkage that your rod is already hooked to, connects with another rod to a stationary bracket on the firewall behind the engine.
If it's not there, you might see the two holes for it on the firewall.
Then a third rod connects the other end of the lever your existing rod is on, to the carburetor's linkage. This one connects to the bottom of the arm on the carburetor, pushing it forward.
If your carb does not have the right linkage, you might just have to hook it up directly to the bell-crank so that it pulls the lever arm on the carb instead.
Like most other vehicles do.
Good luck. Much better description than I can give you by finding that thread and looking at the associated images.
Paul