For speedsters, the choice of carburetors is interesting. If dual carburetors are used, why the popularity of the Windfield and not that of the Tillotson (as seen on Overlands)?
Winfields are just cool!
Most of the older Tillotsons have vanes in them that no longer work and aluminum parts that are brittle and can't be worked with. Winfields are cool. Master Miller are at least as good or better and they are brass so they can be worked on. Some Winfields are aluminum, some are pot metal. All are hard to do much with if they are cracked or bent.
The one I liked best was a Claudel that was on a car I sold about 25 years ago. I wish I still had it. (Both the car or the carburetor)
I have a single Winfield on my '15. The difference going from a straight thru NH to the Winfield was astounding. It seemed like I had an extra cylinder. Are you sure you really want two of them? They come in many sizes, just buy a bigger one if you need more airflow. I can go faster than needed with one of them!