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Very interesting link, Metro. Thank you. Unfortunately things like drag coefficients were not priority figures for cars in 1927, so I don't have suitable information to be able to use the site, however from a cursory study of the table, it does seem theoretically possible to achieve 70 mph from 22 hp, (Is that rated hp or brake hp?) but the streamlining would need to be highly efficient, the engine extremely efficient, and all sources of friction minimised.
The streamlining of the modified car in this thread could in no way be described as highly efficient, and the story says that it performed on the original engine. Cast iron pistons and a compression ratio of less than 5:1 are not conducive to propulsion at 70 mph.
As I said before, the Chev gearbox as an overdrive could help achieve a high speed, but the same can be achieved with engine modifications.
I would have loved an opportunity to study that car and see what else he did to it.
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