From what I've gathered, the best thing for a street engine is an intake port that has had a basic cleanup done - remove casting lines, any bumps from the molds, and smooth out the curves and transitions - but leave the surfaces "rough" like with an 80-grit stone or rougher. 95% of any gains will be from reducing the profile of the valve guide boss, and making sure that the short-side turn from the port to the valve doesn't have sharp turns. Polishing them mirror-smooth is only good for serious high-rpm engines. And purposely putting a bunch of cut grooves in there just seems silly, imho.
Now, back to combustion chambers and compression...