360 timing advance problems

the edelbrock should have 3 vacuum ports on the front of it. One large one in the middle by the idle mixture screws, and 1 on either side of it. The left port (passenger side) will be ported vacuum, the right port (driver side) is manifold vacuum and is what I am assuming you are hooked up to. If my assumption is correct then move the vacuum line from the right side to the left side and make sure to plug any open ports.