I believe John has nailed it in that EBY-D part number does sound like a teapot 4 barrel intake for a 256 Merc.  This would have the smaller ports and be a suitable intake for a 239 without worrying about the gasket mismatch that occurs when using the later model intakes.  

Another intake not brought up very often is the ECB-B intake which is the teapot 4V intake for a ’55 Ford.  This particular intake also has the choke housing as part of the intake like the EBY-D intake but instead has larger ports.  The 1956 4V Teapot intake (ECZ-A) does away with the choke housing flange on the manifold and the choke coil is instead located at the carburetor instead of on the intake.

Lorena, Texas (South of Waco)

I am a newbie to the fifties fords so if i seem confused please be patient as I get up to speed. I just aquired a 60 f250 4x4 w/ the 292/4 speed trans. It currently has the 2 barrel carb, would like to change to the 4 barrel. Will the intake thats mentioned above work for this application?

No kidding.. I Accidentally bought one of these thinking it was a ECZ-B Once.. saw the "B" in the ad and was still learning about Y's so didn't know any better.. It was cool though.. rovision on here needed it so he got it..

Dustin

Southern Oregon Y's Guy

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you could make it work but you'd be better off looking for an ECZ-9425 B manifold.. They take the later style Holly Carbs whereas the manifold mentioned above take the old school teapot style 4 barrel carb..

Dustin

Southern Oregon Y's Guy

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That EBY manifold above will have much smaller ports than even your 2 barrel manifold.  Stay away from that one.

John - "The Hoosier Hurricane"

The intake gasket fit for the EBY-D teapot intake is marginal at best when used on the ’57 and up cylinder heads.  To use a late model carburetor, you’d also have to use an adapter.  As John mentions, “stay clear of it”.

Lorena, Texas (South of Waco)