You can check vacuum advance when you get a timing light. After you set your initial timing plug your vacuum can back into a manifold source and you should see the timing increase. You have to disconnect and plug your vacuum advance when you set timing. You've got a vacuum hose behind your carb that has a small screw in it. That would be a good source of manifold vacuum. A manual way to check your vacuum advance. Hook a small vacuum hose to the vacuum pot and suck on it hard. When you release your suction you should hear the vacuum pot snap. Or while sucking feel under the pot and you should feel the connector rod that goes into the distributor move. Ya' I know it sounds goofy but it works.
Doesn't look like a electronic quadrajet. Here's a link with a bunch of quadrajet stuff.
http://www.florida4x4.com/tech/quadrajet/