Just because a B18CR is more expensive than a D series doesn't make it more reliable. You're forgetting that it's much more highly strained than a low compression economy engine.
Also forgetting to factor in that the B18CR probably gets driven a lot harder (by you and the previous owner) than the economy based D series.
As I already told you, B series are notorious for worn valve guides with age. It is not surprising that it's smoking with age.
Take it from a guy who has actually rebuilt his B18 twice (so you know I'm not some forum troll spouting shit), rebuilding does not change the fact that regardless of how often you change the oil etc stuff is going to break. If you bolt on a turbo to the engine it will break things even more often.
If you want to rebuild, go ahead, it's a fun thing to do. If you want a turbo, go ahead. But just don't expect the problems to come to a halt because of it.
On a side note I have two questions simply out of curiousity:
1 - Why did you buy the engine if you know it's been very poorly maintained?
2 - What parts were "left broken" by the previous owner of the engine?
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