I have an autolite 1100 on a 1966 200 cubic inch I6 that is not putting any vacuum out to the distributor. Ive tried to rebuild it but it may not be right. Vacuum on the manifold line is at 18, idle is at 600-650 rpms, timing is stock 12 BTDC. This is the carb with the spark control valve. Any ideas would be great

 

its only supposed to have vacuum when the throttle is open.