No, there's also WHERE the vacuum advance can ends up. So there's three reasons, including your two. I don't know why this is such a difficult concept to grasp. Sure, it will run the same regardless of where you point the rotor. No one has debated that. But your two stated reasons, plus the one I stated are enough for me to install them per the factory service manual. That's the only way I will install a distributor in anything and it's worked well for me for many decades now. That's why I recommend doing it THE RIGHT WAY. Why there's any argument on that is beyond me.
