This is from Wilson Manifold's web site:
Intermediate porting consists of porting the critical areas of the plenum including the divider walls and roofline, and port matching to either your heads or to a gasket. This cost effective service provides improved performance and distribution characteristics when compared to an out of the box manifold.
I'm considering this but someone on another forum mentioned that he had called and they wouldn't touch his manifold unless the had the heads and the block, because the deck height and gasket height etc... all factored in to the finished job. Which all makes plenty of sense, but this isn't a inexpensive service and i'm looking for any comments, suggestions, or opinons