There truly is pages and pages of discussions on this forum about the "best" carburetor for the standard 235 engine. For ease of installation, the Carter YF 2100S is a direct bolt-on replacement for a truck (no automatic choke). It performs as good or better than the Rochester B did back when it was newly installed by GM (1954-62). In a nutshell the Carter YF 2100S is made (engineered) for the 235. It is the least hassle so you can get on with fixing other problems on your truck.
While you are looking at the Stromberg BIG97, I would seriously learn what your engine needs? This will narrow your search field down quite a bit. Sometimes this topic breaks out into argument (I've done this carb and I've done that carb) on this forum and is probably counter-productive (no teeth in it). I think all agree that the problem with the 216 and 235 engines are that the heads do not flow well (don't breathe). They were designed on purpose for low-end torque not expressway cruisers. Our beloved 235 engines are a notch above a tractor (a Jerry-ism).
As far as the new replacements, I have no experience myself but I would avoid any of the cheap ~$200 clones made in Asia. They currently don't sell their own repair parts and if you have one to fail, it's on you to find whatever you can to fix it. Some businesses that sell carburetor parts may refuse to help you. The clone carburetors made in Argentina (Daytona UN2) have been selling and reports, on other forums, are that some are happy with them. A recent discussion here on Stovebolt concluded that the Daytona was limited (top end) on a 261 engine. Time will tell.
One more thing and sorry for preaching, but simply slapping a new gas filter in-line with your $$$ carburetor and expect 0% problems is not smart. I recommend you start with the gas tank and work your way forward to the carburetor. Replace it all or do a great and thorough job replacing/cleaning or whatever is needed. Past usage of Ethanol gasoline will cause rust in the fuel system of these old trucks regardless of the additives you put in them. They typically are not daily drivers so the alcohol in the Ethanol breaks down to a water component. I run non-Ethanol.
