I seem to remember the Super Chevy article too, and I think the car was part of the Carl Dwiggins collection... If I recall correctly, the article boasted about the rare green interior with the BY paint, but the pic of the trim tag showed that the car was originally fathom green...
I do know there was a BY 69 Z or Z clone at Super Chevy in Bristol TN this year, but I think it too was a repaint...at least it had black stripes...