I am buttoning up this ‘74 -V8 which came to me with no knee pad and no dash vents. I believe I have the correct style event as per a previous thread posted here, but I do not know the correct orientation. Does the vent lever go on the top or the bottom?

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Top

I have seen more pics with it on top, than the bottom. Hard to tell since mine have been taken apart. I am looking for pics in my books to verify.

Pics from books sounds good - I wonder if there are any shots in the manual? I searched for "1974 Porsche 914 sales brochure " but found only 1 pic:

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Brochure, top. Depend on the year of the brochure
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I am just thankful that @SirAndy got us up and running in spite of the attacks of Evil . . .how poor would the world be without the Braintrust !?!

Vielen Dank, Sir Andy!

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Thank you, Gents - lever to the top pour moi!

That's what she said.

How do you get these out without destroying them?

Want to pull mine out to clean them and inside, but afraid I will bust them up.

BTW mine is a '73 and it has a wheel on top instead of a lever

Pull off the hose & push them out from behind. I too have wheels.

Uhhh - I was incredibly scared the first time I pulled these out on my 1973 . . . not so scared on the 1974. I pull them out from the front the front with little concern now . . .just another of the many 914 "life lessons" for me so far.