Cool story Bro. But you are still wrong. Try idling an early 70s Monty Carlo without a shroud and see where that gets you.
Modern cars use more front side ducting and and a closer fan to radiator position, more often than not, that fan is electric. (I deal with this stuff everyday).
Your example is really apples and oranges. We are dealing with 60s and early 70s design philosophy here.
