Weiand Action Plus any power gain over factory 340 ?

Professor Fate said
In my humble opinion, no.
The Weiand is a good street manifold, but the factory one is an excellent design right off the bat. I don't think you would see any noticeable seat of the pants benefit, outside of the weight savings.

Thanks Professor maybe I will put the money towards a good set of headers down road instead of a new intake