Some basic stuff that is likely review for many:
This may be a stupid question, but when the carbs were
"professionally rebuilt" were the throttle shaft bushings checked and/
or redone to not have air leaks? They can be a major cause of lean
running (and are essentially a manifold leak.)
About the choke cable (I'm more familiar with earlier carbs) IIRC,
the motion first should pull the fast idle screw then the last bit of
motion is to lower the jets. Many don't setup the cable to pull the
fast idle only and don't bother with the jets or vice versa.
To adjust the carbs mixture (as well as seating the throttle plates
to close), you need to disconnect the link between the two carbs.
While they are disconnected and the car is running, you can see if
one carb is doing more work than the other.
Wilko
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