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#5
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Both. You can't run the car without them or the vacuum leak occurs. They were original equipment. I had the same problem on my 69 350/300 Z11 when I first got it running. I originally installed the gasket without the steel shim on the bottom and it idled at 1200 rpm and ran like crap. Someone gave me the same advice I gave you and voila, it fixed it.
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