Are you sure it's not putting out to the distributor? Maybe the diaphragm on the distributor is not working.
You can check the hose to the distributor at the diaphragm. Get a new, clean piece of hose and plug it in at the bung below the carb or where every you are taking the vacuum. Touch it to your your tongue while the engine is running. Make the hose long enough so you don't have to lean over the engine. Just because. If you find this too gross, you can use your vacuum gauge instead.
If this has vac, turn the engine off. Then plug the (new, clean) hose to the diaphragm and suck. Watch the rotor and see if it moves from this suction. If not, it's there. However, if both are working, it's probably the hose. R n' r.
Keep the extra hose with your tools. You can use it to test other stuff. I also used it to blow stuff out of hard to reach crevices where the air compressor hose was too big or too powerful or not close byl. And you have extra hose.