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Do you really need a vacuum advance on your distributor? Many high performance distributors do not incorporate vacuum advance and so many people think it is not necessary for a good ignition system. There are a handful of applications where vacuum advance is not a great benefit:
Other than above, for normal automotive applications the vacuum advance will benefit the engine as follows.
The basic reason for all these improvements is that the vacuum advance mechanism allows the distributor to supply a more optimum spark timing proportional to the load and speed output. Without the vacuum advance the distributor can only vary spark timing in proportion to speed and ignores its need for approximately 20 additional degrees of spark timing ("advance") at light loads: (idle and cruise conditions)