The biggest issue I have is where the throttle linkage connects to the base of the carb. That pivot has worn and leaks like crazy. That’s the area I’m looking for help on.
Probably a political problem, not a carburetor problem.

Find someone that has a digital caliper, and measure the clearance from the throttle shaft to the throttle body. If it exceeds 0.010 (10 thousanths) inch, then probably may be repaired with a new throttle shaft. New old stock shafts may be available, depending on which YF.
I don't remember ever doing a Carter YF with excessive clearance. Very rare.
Check this link:
Fuel leak by throttle shaftJon.