[John Poling]

Tony,

Are you street driving or racing your car? I know that it makes a difference in this field. Having the vacuum advance will help the street mannerisms of your car to a point, if your drivetrain is to hefty, a vacuum advance may not do anything for you let alone that it may not work properly.

Vacuum advance will advance your timing at an idle so that you have better off idle reaction, this is why you remove the vacuum line from the distributor to set your initial timing. In a "race" drivetrain you would not need to run a vacuum unit because you would not be worried about your off idle characteristics.

Hope this helps.

John