210 is kinda warm, sure you didn'y have any cooling issues?
I'm in agreement with all above though, its a blown headgasket.
Whenever you have water/oil coming out the header - its a dead give away.
Like Tod74 mentioned it's normal to have really fine slivery flakes in the oil sometimes after the rebuild / break in process.
Tear that thing down and keep us updated.
Goodluck, Cp