Yes, a gasket should be used on each surface. Any imperfection in the manifold, spacer, and/or carburetor surface needs to be sealed completely, those soft gaskets are designed to prevent vacuum leaks.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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