yes the distributor should move, that's what the vacuum advance can does to adjust the ignition timing depending on vacuum .... sounds as if you may have a defective one, replacing it doesn't cost much or take long, should be able to get one from NAPA

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics