Motorhome 440's... factory seconds?

A big rod 440 hp engine i had in my super bee had a maltese cross and an X on the pad.
When i opened it up, the crank was .010 under on the rods and one of the mains was .002 undersize as well. I don't think the engine was opened up until i did it.
I never had a problem with it after i re ringed and re bearinged it all the same way it came apart, and i drove the car pretty hard for years. It always had good oil pressure etc.