351 cleveland exhaust manifolds

if i change my 2v carb to a 4v carb on my 351 Cleveland should i change my exhaust manifold to headers or manifolds from an original 4v or will the stock 2v manifolds do the job

Depends on what "the job" IS. Will they get the exhaust gasses "out"? Yes. Would headers improve performance? Yes. No need for 4-bbl. manifolds, as they are WAY too big (like the intakes) for the 2-bbl. head. Good headers make much more power and efficiency anyway.

Jim

how much more power are we talking with headers