[Visions of youth in engineering school dance through my head . . . ]

The report may be old, but scientific data do not change. Much of the best low-speed aerodynamics research in aviation was done between 1935 and 1955. The NACA charts from the 1950's are still in use. (My aerodynamics text in college was an antique because no textbook written subsequently was as succinct and well-written; I think it was 20 years old at the time.)

In any case, anyone can extrapolate from what you've given us. First, racing DF's have improved with better aero wheels, lower weight (lower rolling resistance) and somewhat better rider position (TT/Tri bars, for example). However, I suspect that the high racer and low racer recumbents have improved even more compared to the old Easy Racer, in terms of frontal area, wheels, and weight. Overall, a light low racer with decent wheels should be the fastest unfaired bike on the road.

It would be a great deal of fun to redo this with today's equipment. My old trike is limited by 1. the engine, 2. the engine, and 3. the weight. Oh, and did I mention the engine?