I think A2 has hit it on the head. Streamliners and roadsters, or Cameros in John's case, are completely different from an aero analysis stand point. A properly designed streamliner should have very little "pressure drag" and that would only be from the area of the boundary layer as it thickens to the back of the body and then recombines at the rear of the body. The rest of the drag for a streamliner would then be skin friction which should be the dominate drag on a streamliner. On a roadster or sedan, which is, as A2 has said, a bluff body the aero calculations depend on the frontal area and the Cd. The long runs of flat sides that many of the present streamliners is not as efficient at maintainling attached flow as the rounded shape that you see in Robs design.
Rex