Much easier to find than the DCO3 set up. The 1960 manifold can be located with effort, and it may be that Ok Parts and Engineering in Germany has a replica of the cold air box. They do have the air-cleaner assembly. The manifold bell crank (high-mount) is made by another builder in the USA now that I have stopped manufacture. I just restored an excellent pair of very early 40DCOE2 large top Webers for a customer, set up for a 1300 101 Veloce. No idea if he might sell them.
The dcoe2's can be found on eBay if you are not in a hurry.
I have a spare intake piece, but I think it is 1600 veloce with larger openings.
Let me know if you are interested, 600€
This part has been vaporblasted.