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We needed a good vacuum signal to run the power brakes, and the best way to get one (at least with a Holley double-pumper and an Edelbrock Performer Air Gap) is with a spacer so equipped. We picked up this Mr. Gasket spacer from Performance Carburetors in Ontario, California. Note the 3/8-inch vacuum port at the back of the spacer. As a point of interest, our vacuum-operated power brakes work just fine.