upside down vin on kansas built big block chevelle

[graperat]

I have 2 what i believe to be original 454 and 396 70 chevelle engines that the vin is stamped upside down on the frt pad of the block.They both where produced in the kansas plant,i did see on the 454 that another vin was stamped over by the oil filter,i have not looked to see if the vin on the 396 was stamped there also,has anybody seen this ??? The 396 car is from the orig owner,the 454 car has the heads off and the deck looks all original with the crv stamp clear as a bell. Need some advice here,thanks graperat