Got Shell 93 Octane and now barely idles 1973 Dart 340

Put on a new a Edelbrock 2696 adapter, but haven't tried starting yet. I am going to a Mobil station that is close to my house for 2-4 gallons of 93 octane.

Here are the pics of the old stuff and manifold along with the new adapter. He used double gaskets cause the adapter to manifold Allen head bolts were too long

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