I used to sell Weber kits. One was dual webers on a offy intake. Sent one to Dutra years ago. That system can probably still be had through Pierce Manifolds. Spendy and a bit tricky with linkage etc.
BUT We also took a single 2bbl weber and adapted it the slant intake. This worked really well.
One moment...
Ah yes they still carry it:
WEBER CONVERSION<br><font color="red">K617</font>
Again there is some linkage to think about (mostly kick-down)
This started life as some sort of Jeep kit and I had them send it to me...with a jet kit. I dialed it in on a manual 225 duster, and then they made that into a new product.
I sold a few dozen of them and never had one come back. Some guys were putting them on fork lifts that had slants in them. (?)
Anyway- it's decent kit, a great carburetor. Maybe a good option for you. Good luck
Oh and the DGV / DGEV are progressive carbs
