Headers or exhaust manifolds?

ConValiant64 said
I've got a '64 Valiant with a 318 and exhaust manifolds hooked up to what appears to be 2'' or smaller exhaust. I'd rather have 2.5'' exhaust with Flow Masters or some type of throaty performance mufflers. My dilemma: Do I keep the stock exhaust manifolds, buy better flowing manifolds (ie HP 340), buy shorty or full length headers? It would be helpful knowing the collector size of the current exhaust manifold a so I know what my options are. Any thoughts?

Unfortunately there isn't a whole lot of option for the early a bodies, I've got a 63 valiant and I'm using 360 magnum manifolds with 2.25 exhaust only braise I didn't want to spend almost 1000 on headers, those spitfires can be had for 500/6 but not sure you'll gain much on your 318 to justify it.

Jake