Is the vacuum source like in my setup below necessary? My thought is that my piping will get oil in it from being routed like this? Also from what i can see is the drain on it is going to the back of block?? I want to change this to make it right so help is greatly appreciated. Ive been reading for about a hr on this and have a bunch of mixed answers as to what to do.

 

that setup will work just fine. but generally a vented can would not use a preturbo line. a drain is a good idea IMO, so that can doesn't overflow.