Funny that you should mention that.
I started out just wanting to give the engine a little boost, so I radiused the intake opening in the crankshaft. The area where they cut a flat, the entire sharp edged perimeter was radiused but not where it where to the O.D of the crank as to change timing or promote leakage. The lower out side edge of the boost and transfer ports were radiused, keeping with the rear wall aim in mind. The outside diameter of the fuel inlet in the carb's throat was air streamed also.

When I ran it, it exhibited symptoms of an engine with too much compression. Apparently it was stuffing more mixture on top of the piston. I went to FAI fuel.... low and behold, it pulled the same prop better than it did stock on 15%. The problem is I had so much 15% fuel on hand, so instead of shimming the head, I raised the exhaust port with two notches on each side of the window's center post. This helped lower the compression and gave me extra boost on the pipe. I cant remember how much it was raised, I think it was 180 degrees. Had to increase my Idle speed a bit, but I gained 800 rpm with the same prop and lost some fuel economy.

Everything is a balance, give and take. Worth it? Naw, just get a bigger engine.