It wouldn’t be good for rebuild to fail obviously. From your experience how many miles can you get out of a rebuilt engine versus dropping in a lower mileage engine assuming that engine is in good shape and has low miles they say it does. The only way to see how much damage possibly been caused to my engine from the chain rubbing up against metal where you get the aluminum from obviously is probably be dropping the oil pan in checking the front cover for more metal debris and see if there’s damage there too.