What is the difference between "timed" and "ported"? Are they the same just different terminology?

After doing some more reading, this Winter I am going to buy a distributor that is setup for manifold vacuum advance (which comes with a lower rated can).
I like the idea of having more timing at idle (especially in D at a stop) and if the distributor is already setup for manifold vacuum, then the idle should not fluctuate as others have witnessed.

Thanks for all of the replies in the past on this issue.

Thanks