Just keep in mind that cnc ridges won’t bother a thing and may help. When I port my own heads it’s a double flute burr finish on every intake side. I would take a semi rough sanding roll to customers ports because people like smooth.
This time I'm going to spend some time with surface finish. I'm with the crowd that says when the airspeed is high, you polish the surface and when it's slow (or not there at all) you burr finish. Or use a 40 grit paper roll.
It's been so long since I've done some W2 heads I can't remember if the center exhaust ports have air going in both directions at the same time at .200-.400 or so lift numbers. I know a bunch of bow tie exhaust ports will do it. Can't remember if the W2 does it or not.