iyoymanalo wrote - " What’s the difference between a marine and car application? How can I tell? I think the ones for sale on Amazon and EBay are marine though." I don't know how you can tell the difference between marine and auto carbs externally but a marine carb would be jetted differently.
You previously asked how to find the Stromberg manifold and carb - the ones I used came from Canada on B21A motors. Those were purchased many years ago from Canadian sources so that's where I'd start.
Here's something thing I did when mounting 2 bbl 32/36 type carbs - add a source for coolant to pass through to heat the manifold to avoid "icing" (a marine manifold may not have that built in-I don't know). Renault LeCars (R5 in other markets) used a 30/30 version of the Weber downdraft along with a separate aluminum plate mounted directly under the carb that had a coolant pass-through for that purpose. - Dave