Extrude hone exhaust manifolds or not

Has anyone extrude honed their stock 340 manifolds for more performance? Is there performance to be gained here and is it worth the effort? I am building a mainly stock 340 with some mild head work and performance exhaust from the stock manifolds. I do not want to run headers. Any literature on this such as a performance test you know of?

How about the intake manifold while we are at it?

Thanks for the info.