Basically yes. What setup are you running? Highly cammed street engines most definitely benefit from a manifold connection (and other tricks) to try and make them more driveable. If you've a stock (or stockish) engine I wouldn't bother. I mean sure, try it, you can experiment - but I suspect you'll discover the same thing the engineers figured out 100 years ago. A ported or "timed" distributor connection (above the throttle plates) was invented to ensure a smooth, steady idle. A manifold connection to a stock vacuum can will often result in a kind of negative feedback loop ... and a varying idle RPM. Surprise! It's more important in my view to actually understand the entire timing curve itself and how vacuum advance actually works (and doesn't work!) than what port connection is used. Either will work excellent so long as it is setup correctly.