Motorhome 440's... factory seconds?

My dad and cousin went to rebuildin the 400 that was in his 74 Adventurer SE and didn't bother to check the numbers on the rods and caps because usually they were all numbered from the factory. Motor had never been into that they noticed.

Well.... when they went to put it back together, they noticed something whacko with the rods.
Instead of numbers, they were marked with a maltese cross, spaid, heart, diamond, club, etc, etc!! No numbers!!!

Ended up just putting whatever in whatever hole. Sounded like a diesel when they first started it from the amount of rod chatter.

Been driving it since with no problems and that was in 2003 or 4.