So what's the deal? Which carb is the right one?

slantsixdan said

Same casting used for carbs with/without external bowl vent, with/without cold idle secondary enrichment, and with/without other features. Don't worry about it. Hook up the hoses that your car has to the correct ports on the new carb, and cap the unused ports. Easy.

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So what would be the harm if I simply capped the charcoal canister nipple where the canister-to-carb line goes? If I end up using the 902 carb (the NOS one that doesn't have an attachment for the vapor return system) that would effectively isolate the charcoal canister from the engine and eliminate a lot of underhood plumbing. What's the harm in this? Would a lot of gasoline accumulate in the canister?