a place that can do what is called a "slurry hone" on the ports I would take a look at it. It is like polishing the intake and exhaust ports. Makes them nice and smooth which helps in breathing. I have only seen it talked about on Horsepower TV (I think it is called "slurry hone") and have never seen a shop in the Macon, Ga area that can do it. I would assume that people that build racing engines would know where you could get it done. With the head apart would be the time to do it.
Jim
'85 300D
'95 E320
'98 CRV