To remove the lower intake, you will need to remove the distributor. Index the rotor to the edge of the distributor with a permanent marker and pull the distributor free. This will allow you to insert the distributor back in the same place (providing the engine isn't turned). Remove the intake manifold's 12 bolts and pry the manifold free of the heads. Loosen the bolt holding the heater tube last. Sometimes you can pull the intake and tube together.