carter carby leaking internally

[interc3]

Hi, I have a late 1973 interceptor 2240/9247 engine no. 4C12222 , 80,000 original miles .The Carter thermoquad carby is leaking fuel from a small inclined tube into one side of the barrel at idle. The car also stalls when in traffic on a warm day, does anyone have any ideas what the problem is?