Vacuum advance information and myths

There are certain situations (very limited situations) where you can’t use VA on a street car.

Other than that, you need it.

And, if you NEED manifold vacuum at idle you don’t have enough compression, your cam is too big or both.

If that’s what you have then by all means do it. It’s cheaper than getting the compression up or changing cams or both.

IMO it’s better to build it right the first time.