The 2bbl intake will not accept a 4 bbl carb. There may be adapter plates available, but I can't imagine that kind of swap would be worth your while.
I don't think you will notice any performance gain if you switch your C-code ( 2 bbl ) intake / carb for a 4 bbl intake and carb. The only thing you'll notice will be a decrease in your gas mileage with the swap. Factory C-code cars were rated at 200 hp and A-codes were rated at 225 hp...not much of a difference.
Your car seems so nice and clean - and stock - so I would recommend keeping it that way, especially if it is an original C-code car. Now, if it is a factory A-code ( 4 bbl ) car, then I would definitely locate a correct factory 4-bbl intake and carb, but otherwise, stock is the way to go.

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