http://chevellestuff.net/1969/bs.htm
According to this write up you will find the build sheet in the trash can on the assembly line.
I have looked casually through my 1969 Fremont Chevelle but haven't found one. I do remember a write up explaining Fremont build sheets to be very rarely found. (that was by memory, probably should stick with facts) I had a quick look on TeamChevelle but didn't find the article.....
Ryan
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1969 Beaumont 350 Auto White Sold
1969 Beaumont 307 Auto Green Sold
1969 Chevelle SS 396-L35 Auto Blue Sold
1969 Oldsmobile Cutlass 'S' Sports Coupe W31