Originally Posted By Tom_Quad
STOP!
based on the description of the problem it appears that fuel is leaking past the o ring on the needle/seat on one or more carbs.
You will probably see fuel coming out of the vent on the offending carb. Don't make this harder than it is


yep, a holley externally adjustable needle has more than one way to leak!
if they go into the bowls too easily, the o rings may have shrunk/hardened and will need to be replaced. Drove home in stop-and-go traffic one warm day, not fun!