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The throttle body bolts on just like a Holley 4150 square-flange carb. This also meant that the existing linkage all worked, including the throttle return springs. The fuel supply and return lines connect easily, and we took our time to keep the lines running low for air cleaner clearance. We then double-checked the throttle linkage, insuring it opened fully when the gas pedal was depressed. We also watched for any binding, rubbing, or other contact issues.