Engine burning oil after rebuild

[CM870]

Over haul was done by MHC kenworth in Kansas City from what the papers say everything was put OEM in frame kit total came out to 25k the head however was brought in by the owner so it’s probably not a new head also it has about 45k miles on the over haul no blow by it drips about a cup of oil over night if truck is idling I try not to idle it much but winter is almost here so that is gonna change but it take about 10-15 of idle time before the cloud of smoke appears when I take off as soon as I start it’s gone truck drives normal no coolant loss at all just oil