As mentioned many times there is not that much pinch in the P/S set so the break in must be easy. But the scratches do hold oil what will result in a better lubrication and a better sealing (more compression). On the other hand no real problems with this motor are found on the web.
Let see what this does, the timings are about a N21-5T motor so I hope to see some equal performance. I think the P/S set will wear faster.
The engine must go back to the owner so he can break it in and do some tests.
And nice to mention is that it seems it can have Novarossi rods.... Also the P/S set has the dimensions that it will fit in a Novarossi. With an old NR motor and this 20 euro costing P/S set you could bring back some life.