Too much air pressure on valve cover breathers

Well that sucks, er, blows.
If the exhaust is free-flowing, and the rings truly are "broken in", Then somebody may get to do a, do-over.

I suggest a leak-down test. Both a normal TDC one, and a low-pressure sweeping test from BDC compression to TDC compression. The first will give an indication of the ring seal. The second will reveal a gouged cylinder wall.
The sweep test is tricky, and cannot usually be done with more than 30 to 40 psi.I turn the air on and bring the piston up to the point where the intake closes, then reposition the Johnson bar, so I can do a step test. I crank the bar over, about 1/8 to 1/12 turn and stop/hold and listen for escaping air as well as checking the gauge. Then continue, another step, and so on. To reposition the bar, I shut the air off first.Its good to have a helper. If cylinder wall is damaged, it will show up real quick.
You dont really need a L/D apparatus for the sweep test, but you do need a regulator. And a point-of-use shut-off valve is real handy, too.