When/if you rebuild the engine you can measure the cylinder walls for out of round. Oversized Pistons are available in two sizes if it needs to be bored over. Cylinder head will need a rebuild for sure, they seem to wear the guides, valve faces and valve seats within 150k miles. Crank and rod bearings hold up really well, most engines that I rebuild I can re-use the main bearings.
If your looking for 200+ you will need to port the head, get studs, build the pump and upgrade the turbo.
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