I only got my EA a few months ago and it didn't have the hot air pipe at all. Considering I live in Qld, its not really needed anyhow.
To complete the missing pipe, I blocked the vacuum hose for it at the manifold tree, and using a short piece of vacuum hose, looped it on the two vacuum points under the tennis racket (have CFI).
There's enough temp in the motor within 1km to not care about short trips either.
I guess down in Melbourne or somewhere just as cold in winter it would be benificial to still have the hot air intake system.. but not here.
88 EA Falcon S
RIP my ol' esky.. many years of good service