The most efficient place to take air from for an intake is the stagnation region (i.e. low velocity, high static pressure).
Naca ducts are typically placed in areas or high velocity and low static pressure. They can work, but are dependent on good attached surface flow and flow velocity (hence their use on aircraft that typically operate in limited reynolds regimes). On cars they are a bit more problematic because of the relatively slow flow speed (compared to an aircraft), poor boundary layer attachment and constantly changing speed. An ill placed naca on a car will cause the air to flow out of it rather than in.
Now a streamliner somewhat blurs the line between car and aircraft. In that case expect a more attached boundary layer than a regular car, obviously higher flow velocity and a limited use case. So for a streamliner I think you are well placed to use them, but identify your locations well otherwise they will reverse flow. I'd probably avoid them on a Roadster though.
