I have been fighting a surging, lean, problem with both the Holley and the Carter 2bbls.. Since I have 2 Carter carbs on hand I have enough parts to tweak it without burning my bridges. I decided to drill the jets out which I did with a 1/16" bit. That is the smallest I own. I tried that with still some surging. Then I got into my Eddy carb kit and used a heavier metering rod spring. Voila, that seemed to do the job! So far it's running much better.
Rich Kinsley '64 Dodge Polara 4dr LeRoar 318poly w/less goodies