Carb question

#1
Hi folks. I recently purchased a 881 dual quad intake with Carter AFB’a on it. Front is a 4299S with 16-546 written on the airhorn in felt marker, and rear is a 3612 with 16-165 written on the airhorn. Will these carbs work on the intake? Are you familiar with them? What would the writing in the airhorn mean? I am told that the previous owner ran these carbs on the 881.
I also got a 3858S in the sale as well, would this work on the dual quad?
I’m looking for any info you may have on these carbs and their application. Many thanks in advance.
 
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