Switching Engines on "01 7.3

[dragon71]

Well, The 7.3 is getting switched in my truck, It is low on compression on 1 cylinder by 100 PSI or so. I found a used engine out of an '01 with about 150000 miles. I have a friend switching the engine for me.He got the radiator and intercooler out and called me that there was a lot of oil in the intercooler. Also some in the intake side. Almost has to be the turbo, right? I put in a K&N air filter about 2000 miles ago and he said it seemed pretty heavy with oil. Should we go back to the oem type filter?
Also, this engine came out of a 2 wheel drive F450, is the pan the same as my F250 4X4? Should we check the rod and main bearings while the engine's out?

[countryraised]

You need to reroute the crank case vent, you hare pulling the blowby and all the oil vapor into the intake and it settles out in the intercooler, also can be hard on the turbo.
Also The K&N filters are not a good choice on turbos, they let too much dirty pass and the oils in the filter also get pulled into the turbo.