Still burns oil on 1994 Ford F-350

I rebuilt the engine and it still goes through 1qt every 100 miles espescially when idling

1 answer 1 comment
explain what you did to rebuild the motor.

Roy
Complete rebuild at 130,000 miles ,top and bottom end. Now has 160,000 miles. Used cast iron rings, after the re-bore. of course new everything was included. I understand that it can take some time for cast iron rings to bed in but 30,000 sounds like it should have resolved by now. I thought it was the PCV valve because it smokes like hell at 850 rpm in idle.
Thanks in advance . Howard