I have x11 body tag and when I looked up and research everything I found that it was 1969 September black interior bucket seats v8 made in Ohio from 243,085 it was the 194,724 th. car made and it was blue on the exterior that's all I could figure out... But from what a pro builder told.me it was a true SS when I have him Vin and tag info what's best way to verify it