Tips on breaking in a rebuid?

[6cylinderstepside]

I am picking up my rebuilt engine tomorrow morning. Just a regular rebuild long block with no frills. Same pistons and cam, but new liters springs, etc. since it has the original cam I assume I don't need to break in the cam but I will need to set the rings. So once I have it all put back together and on the run stand any tips? I have heard run it at 2k RPM for two min but that's from my feeble memory. I've swapped tons of engine and stabbed tons of distributors so TDC and timing is not an issue but I've never had an actual rebuilt motor that I had to break in...

It's an inline 6 250 by the way.