I really don't know...and I guess that's why I'm asking. It seems that the 67 balancer is readiliy available, while the 68 is really hard to find. Is it beacuse of journal size??? I don't know.
Look in all the major Camaro parts vendors catalogs. It starts at 67, skips 68 and goes onto the 69's and up.....it makes you think that there is something really special about this balancer......