[reclino]

It's.been done a few times, I just did a quick dirty forum search and these came up
Preventing icing may be required.
I would think a 4 barrel is to large for a 911 engine.
https://forums.pelicanparts.com/porsche-911-technical-forum/357313-oh-yeah-buddy-kill-newbie.html

And this one
https://forums.pelicanparts.com/porsche-911-technical-forum/452264-911-american-carburetor-swap-3.html

There was someone else recently who made his own manifold, and I think he was somewhat local to me in eastern North Carolina... Can't remember who it was.

Found it

https://forums.pelicanparts.com/porsche-911-technical-forum/1085924-now-something-completely-different-part-1-a-2.html#post12342294

https://forums.pelicanparts.com/porsche-911-technical-forum/1163636-now-something-completely-different-part-2-a.html#post12277210