twin Webers for sale

For sale, twin, two-barrel Webers set up for Z cars.  Imprinted on one side of each is the word "cannon," and on the other side "2830."
The stampings on the outer ends of both are are left: "DGV 5A  32/36" and  to the right: "D6."  

These came to me with a parts car I bought, and I have never run them.  They do appear complete, and come with air cleaners.   Asking 350 U.S.$, or 450 CAD$