Thank you for your comments thus far. I was hoping I asked a specific enough question without having to go into the often-repeated dissertation of which engine modifications have been done in order to justify our choice of a 2x1 manifold.
By accident, in our browsing for carburetor adapters among those suggested above, we spilled upon the fellow that is selling new castings of Thickstun branded equipment on eBay. Conveniently, it appears that he sells a carburetor adapter that adapts from a 2 15/16in 2 bolt mount to a 2 5/8in 3 bolt base which will allow us our choice of running the following carburetors: Stromberg 48, 81, 97 or a Holley 94. I incorrectly measured our Thickstun intake, it is not 3inch 2 bolt spacing, but in fact 2 15/16inch 2 bolt spacing.
After considering the alternative carburetors suggested above, we also found that the folks at Stromberg-97.com produce an improved version of the Stromberg 81 (which flows at 116CFM) which will satisfy the CFM requirements of our Chevrolet 235 if we use two of these on our Thickstun intake manifold. We were hoping to use a carburetor that would compliment the aesthetics of the era of the truck and their new Stromberg 81 fits the bill.
Finally, to answer CarbKing's question, we found two or three tagged Stromberg carburetors at the 2021 Pate Swap Meet, but none of them were the BXOV-2 model. We did find, however, one extremely crusty BXOV-2 missing its tag.
At this stage, it appears that we now need to buy just a few more pieces and we'll succeed on this 2x1 carb installation. Thanks Stovebolt forum, we'll see you around!
