Although new to all of this malarkey,here are my thoughts for what they are worth.
I would imagine that the carbs you have bought will be fine once suitably jetted to deliver the correct amount of fuel.
From my research. I believe that the 600cc carbs are just about the ideal size to provide the correct fuel to air ratio needed on the 1800-2000cc car engine. Only minimal carb jet changes needed.
I assume this is the reason that 600cc carbs fetch so much more money than the larger ones.
