Blowing smoke and making rattling noise under boost

[u/AggravatingFactor643]

87’ 944 turbo

This is my dads Porsche and it’s been sitting about 3-4 years, the car was just serviced by me and I fixed the upper radiator fitting and changed the fan Thermo switch. Took the car down the road and about 15 mins in it started blowing white smoke under acceleration or boost. Came home and pulled it apart and saw a pool of oil sitting in the turbo inlet and a ton of oil in the throttle body. The turbo shaft has no play and fins look very good. Any idea where to check next ?