The five port factory TVS is fitted with a jumper block that eliminates two ports on a '69. The block is often a hard to diagnose source of vacuum leaks. On earlier models, a service bulletin looped those additional two ports with a hose.

Just hook the vacuum lines up directly. If it did not come with a diagram, connect D to distributor vacuum advance, and to determine which is ported and which is manifold vacuum simply test to see which port is open when cold, and connect that to ported and the other to manifold. The bottom port is most likely the ported vacuum.