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The fuel rails required us to raise the carburetor enclosure using a carb spacer (under the enclosure). This change required use of a spacer between the original cast-aluminum elbow and the inlet into the enclosure. Lucky for us, the bolt pattern of the elbow flange matched that of a 5.0L Ford EGR spacer. Accufab took one of their aluminum spacers for a 90mm throttle body and machined it down to the required 1.23-inch thickness.