Nealio, it's not that simple. There are at least several different models q-jet, and the timed/manifold nipples are in different places.
You can use either one, it just affects the way you set up the initial advance and the mechanical advance. The intent of the vac advance is to advance timing under light load part throttle conditions (cruising) to maximize gas mileage. I have had better results use a timed port, ie one that provides no or very little vac at idle, then provides vac as the throttle is opened. It makes things simpler and that is good for me.
My advice is to read up on what the vac advance does, how it does it, and determine which nipples on your carb give vac at different times. Then when you set it up your car will run better and you will have a good have a good understanding what's happening. Unfortunately I'm not familiar enough with the different models of the q-jet to give much help there.
John