A general observation on these trucks: whenever ya want something done quickly, disappointment awaits you at the end of the day...as parts stores rely on computer databases for inventory control, vehicles that have been out of production for over 10 years are harder to get parts for, with the dreaded "back order" listed in the parts availability field on their inventory listing...as parts books gave way to these computers, and knowledgeable counter guys were replaced by hygiene-challenged clock watchers, I learned that it makes life easier to accept that any replacement part can take a week to get...if it takes longer, that's fine too as long as I can get it; if it takes less than a week, we'll that's a nice surprise
As for your carburetors, I have learned that you must identify the carb in question accurately to obtain the correct kit. The pictured carb appears to be a Carter Ball & Ball, the model should be stamped into that vertical triangular web from the throat towards the fuel port...might possibly be a "E7T1" or something like that... might not even be original to the truck, so ordering carb.kits by truck model and year will lead to more disappointment... my '48 that has been in the family since new has a '55 Plymouth 230 that no one remembered being swapped out for the original, it also has a D6G1 (Dodge car?) carb with some sort of idle linkage that I think works in tandem with a thermostatic choke that is not present... it took some education to get that all sorted out...ordered a carb.kit from Roberts and a week later I was in business... your mileage may vary