Ive heard it both ways about port/polishing, bowl blending, acid dipping after and the like. Mirror polishing exhaust ports makes sense for maxium out flow. Removing casting flash and hard turns and edges from an intake port the physics is easily understood also, like when your buddy stands in front of the fan it makes a difference in your comfort level right so you tell him to move. The science is in flow maximizing versus the surface finish left in the intake port. The micro roughness left further increases the air fuel blend on its route to the chamber for burning. That ratio of whats been worked versus whats been left alone is what makes some motors winners and some just get the partipation trophy. I know this isn't a winston cup car but the tech is the same. Get your dremels out and experiment some. Like the lottery, can't win if you don't play. Good luck all.