[Big Block Bill]

I just got my Arlington built LS-6 shipping data report back on my car yesterday. The blue mylar sticker on the driver's door (with the VIN#) states it was built in 3/1970, the trim tag states 03D650 and the report states the GM official production date is 04/01/1970. I only have the original window sticker as documentation prior to the NCRS report. Is this normal to have conflicting production dates? Is there still a way to get my original window sticker validated by the NCRS, or do they only do that for Corvettes?

Bill