[Too Many Projects]

The title to my '70SS Chevelle has all the option codes from the trim tag as the registered VIN number. It came this way to me and transferred into my name with no issues. I would like to have the real vin run to be certain there are no skeletons in the closet before I take it to my DMV/State Police/Inspections to get this changed to reflect the actual vin on the dash.
I did run both the trim tag "vin" and the actual vin thru the free, online NICB checker and they both came back clean, but I assume there is a more thorough check that can be made.
Does anyone have a good source to have a verifiable check done on the actual vin ?

Thanks
Mitch