[Argess]

Keeping in mind the twin Holleys are mounted backwards, I checked the inside of the carbs and found evidence of evaporated gasoline around the air bleeds, directly below the vent tube for the secondary float bowl (which faces forward).

I must put a few drops of gas down those air-bleeds when the enigne is idling and see if I get the same low-idle symptoms.

My float vents all point up, but i've seen pics of some Holleys where a single tube connects both air-bleed ports and has vent hole drilled along the top of the arc of the connecting tube. Seems like a good idea, other than it could mess up the airflow a bit.