Vaccum Assisted brakes

[65Cabby]

I have a question on the vacuum pressure required for a servo assisted brake system.
I'm fitting a 944 master cylinder and booster but am pondering the method how to get the vacuum to it.

Should I tap each of my inlet manifolds to even out the pulsing cycle? , will I need a one way valve? Or do I go for an electric pump??

Just out of interest as I've never looked at a scooby engine that would originally have a vacuum system, are they always single induction bodies with one vacuum pipe or do some have twin setups.

Thanks