Well, have you tested the BOV? If you don't know how then just pull, plug the openings and go for a drive. One drive isn't going to kill anything that's not already 99% shot. If the BOV is leaking then you're overworking the turbo and pushing air that a lot hotter than it should be into the engine.
It's 10 degrees BTDC on the timing (and don't forget the jumper).
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