Jeep 4.0 low oil pressure, rebuilt, with new head, new everything, measured clearances, need to find where thrust bearing should go?

When I rebuilt it, I could not remember where the thrust bearing was located, but the oil holes would only line up with the thrust bearing on either the 3rd, or 5th connecting rod(I put it in the third). I am getting no noise when I get it started, it will run, and have pressure, till it gets warmed up, then drops to -0-. I had the block cleaned and bored, I have good piston compression. There was antifreeze in the oil, cause the steel head gasket that came with the kit blew, causing antifreeze to leak into the oil, I replaced the head gasket with a composite, and now no problems there. Next, I will drop the oil pan, and re-check all of the clearances.