Have you thought about purchasing an already run in engine and just drop it in and go? Running in can be done yourself but from what i understand its very boring not being able to boost hard or have any fun ... basically drive like a granny and have regular oil changes, there is a guide somewhere on here! P&P are great but to ensure your engine is safe as possible emanage or standalone ( apexi, wolf or Motorsport electronic ecu ) would be best as the mapper will ensure everything is running good! As with picking your engine builder, research is needed for the mapper as all have good and bad feedback but you need to make your own mind up on that Just my thoughts James