This Mustang Parts Installation Guide Works For
Now read and understand all the next step before starting it because you will have 30-45 minute to put the silicone, the gasket, the intake and torque all the intake bolt so be ready !
Now check the base-to-intake gasket if they are in their place. when you are sure that it is right in place the rest it is the same as the removal ( thermostat, carb, and replug all the hoses and wires).
Very important :flush your radiator fluid, change oil and filter. now i recommend to wait a minimum of 24h before you start the engine to ensure that the silicone is dry.