Those are Cannon manifold adaptors for a late 240/260 Z car to install Weber
DGV carbs. The piece that you have screwed in place of the existing carb and
allowed the use of the downdraft carb. Actually worked better than it sounds.
In a message dated 04/01/2000 9:53:55 PM Pacific Daylight Time,
> When I bought my parts car the PO gave me two webers that have intake
> manifolds that don't fit my head. I don't know what they do fit. I
> took a few pictures of them. If you know what they fit and which weber
> they are, please let me know.