Using vacuum gauge to tune engine?

Thank you everyone for all the advise. I’m testing the vacuum off of the vacuum port on the carb not the manifold and the distributor is an electronic one without vacuum advance on it. Should the timing be about 10-15 BTDC on initial and about 30-34deg BTDC in when fully advanced?
I set the pre-load on the Harland sharps when I was working on that particular cylinder intake and exhaust by feel. I set the rocker so that it just starts to compress down on the pushrod and hydraulic lifter then went another half turn about .030-.050 thousands to lock it in. Then tightened down on the lock nut above to lock it in. It does sound like there is a lot of clatter with the rockers. Do you think I should recheck the settings?