If you still have the original tank you could find the build sheet glued to the front of it. I don`t know if it`s possible to reach it without lifting the body or dropping the tank. As far as I know all c3 (and c1\c2s?) had the build sheet glued to the tank, but a previous owner could have taken it as a trophy or it may have fallen of after 42 years (or is it 43?). If it`s still there it could also be unreadable. If you don`t find the build sheet here, you can tell if it`s the original tank by looking for some yellow glue where the build sheet was. I really doubt anyone has ever glue the old build sheet to a new tank.How do I find out what options came with my 69 Corvette. Power options, exterior and interior color, motor size big or small block etc?