Carb and carb adaptor question

[bosco200]

Hey guys, so I have 72 C20 with a inline 250 and a single barrel mono jet carb, the carb is shot, I've rebuilt it multiple times and it's just doesn't have much life left to it, so I was wanting to put a 2 barrel on, and was wondering what adaptor I would need and what carb would work best, the engine is completely stock. If you could give me a link for where I could get them that would be great thanks.
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