Ed on this point I have to disagree with you. Polishing the OD of the crank reduces friction through the case tunnel. Polishing the pin before the first run in greatly reduces crank pin wearover the life of the motor. And polishing the crank tunnel can be usefull if you want to use the rotational centrifical force of the crank for improved distribution.(not flow) If you just want to drag air through a hole at the lowest restance then polishing the tunnel is not what you want to do.
PS whats new dude. Long time no talk.

Opinion: After 30 years of modifying engines I have this advice. You need to ask yourself why you are doing what you are doing. After you've asked yourself that question and you have a justifyable engineering reason for doing it then and only then should you do it. Otherwise its just hacking and whacking. This is what seperates the pro tuners from the rest. A pro tuner can tell you exactly why he does what he does and can back it up with theoretical physics. as far as balancing goes there are very few who understand how to go about it properly, and those who know literally won't discuss it in more than generalities. The same goes for overall transfer timing interaction and piston speed based on stroke. (one of the most critical things in the engine next to the tuned pipe)

One last comment from somone who has been doing it a very long time and I am sure ED and Uriah will agree. Everytime you think you know what you know somthing comes along and blows your theory all to hell! If you have not experienced this you haven't been doing it long enough.