This is why i rebuild any engine i get now - no matter who its come from or what the history is. But yer i'd say its most likely rings/bore wear unless your turbo got damaged in the last meltdown??

As you've saved me so much hassle over the years, you are more than welcome to help yourself to one of my spare blocks. Iirc, i've got an unused since it was freshly honed, +1mm bare block (1600 N/A but obv not difficult to mod for turbo) that i had done a few years back before i ended up going ZVH if this helps out at all?
Would have been my next engine build but tbh I'll probably go full zetec next time.