Busa pistons can get hot at that point and nip up the ring and ruin the bore. Worse on a Busa as they are plated. Doing the mod gives a bit more room for error on the fueling. But if the fueling is right then no proble.
Do like the new frame set up. Look forward to seeing it finished.
One question on older post. How did you clean up your combustion chambers, what did you use? Ta