Many different opinions in my group and around the site about this. Fuel atomization is very important, there is plenty of turbulence going on in those cylinders regardless. I'm no pro at any of this by any means, but my bet is that if you used the same cylinders with a rough intake on a dyno compared to a smooth intake you wouldnt see ANY difference. I personally have a smooth intake (can see my face in them) and rough case halves and trinity intake (swirl intake). My buddies K&T ported cylidners are VERY smooth aswell (came that way), the only reason I smoothed mine out really. I figured that if K&T did them that way I would definately follow them rather than trinity. Which offen makes me think why wouldnt I get K&T ported cylinders instead on trinity lmao. But needless to say here is what I run:
Before:
After: