340 - Stock Exhaust Manifolds or Headers

You didn't provide any engine specs, completely stock or small mods. Headers add more on a modified engine. Most of us probably ditched our manifolds back in the day for a set of "cheap" headers, before the TTI/Dougs offerings. You'll leave a bit of power on the table with the stock stuff, if your ok with that run the manifolds. If you decide to run the headers run a coarse file across the ports to make sure they're flat and run a good gasket.