You can also purchase a new Zenith carb from most tractor supply outlets.
The Zenith model 267 sub model 14991 will work.
You can also find a good used or rebuilt Carter BB-1 carburetor.
The Stromberg is your performance carb and as Ross said you can buy a new housing and reuse your internal parts.
But move fast, as they will be closing over the next couple of months.

It all depends on your budget

Rick

Where Are You From? Fremont, CA

Do You own a car built by Durant? Two of them