Maybe, maybe not. No one knows for sure. Chevrolet didn't keep those kinds of records but poeple LOVE to make up numbers!
However, fcs66 from our site may have some information on this, so hopefully he'll chime in. In the meantime, read
THIS.
We DO know that "most" Z10's were equipped with the L48 (350/300 engine, so it's hard to say.
Ed