Thank you. That is right, now I understand. Vacuum advances spark at idle and cruise conditions for more effiecient burning. My Edlebrock carb had two ports one for timed vacuum and one for manifold vacuum. I put the hose on the manifold vacuum port to the carb, should I have put it on the timed port? Remember this is just an engine in a T-bucket and not setup in a car with emissions equipment on it.

thanks for your help.