Hi Jeff -
remove the throttle cover and notice the black tube running along/below the fuel injectors - follow it to the throttle area.
2 possible places from my experience:
Coming apart where the black tube goes into the rubber elbow -
or at the bottom of the rubber assembly covering the flame trap.
The rubber assembly might be eaten/cracked by the acids - but it is most likely in the bottom where you can't see it. A dentist mirror from the dollar store comes in handy here and many other places.
The black tube seems to get stiff and brittle - and deposits inside it narrowing it - maybe it should be changed together with the flame trap.
My old Ferrari designed Rover V8's with Webers and SU's was nasty at this even with 1" breather tubes - I had to clean the cam covers inside as well.
You can take your carburettors apart - there are lots of good web sites out there with good advice - unfortunately I deleted mine after selling the car...
I still get laughters and disbeliefs when I tell about how I balanced the carbs by putting a tube in each of my ears - but it works, listen for the hiss.....
http://www.hjemme-er-bedst.subnet.dk/284318.htm in danish about Rover V8
and a picture of the carbs
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