Engine stalls.

that is different from the way mine was. i had the same set up. my A was connected to B with a one way valve in the vacuum line. the open vacuum port on the side of the carb went to my vacuum advance. another thing you can do is tie the choke all the way open, plug off that vacuum port or connect it the advance on the distributor and drive it. see it dies. if it does the choke is not responsible for the stalling.