When I remove vacuum line from carburetor, the engine idle stays the same. Isn't idle suppose to increase?

I have a '72 GMC Custom-1500, 350 engine/4 bbl Quadrajet 4MV, and an automatic transmission. I replaced points distributor with a HEI distributor. I don't believe advance is working. How can I check it without any special tools? Also, when I remove vacuum advance hose from carburetor, the engine idle doesn't change. Isn't idle suppose to increase or something?