i definitely had a 2-piece balancer, but it's the orginal-type with the rubber-ring. The rubber ring did and does not move anymore. But while pulling the balancer, I pulled the outer ring from the interior piece. Of course the rubber ring got loose while doing so. We managed to press the outer ring back on the inner piece with the rubber ring in between. That was hard, but it works for 15 years now.
I looked in my 93 parts catalogue from Classic Industries and the balancer was at that time at about 130$. Now it's a little more than 40 $, and they say now, that it is an original GM replacement part. On the other hand, Year One offers the balancer for about 140 $. I cannot explain the difference.
Thank you for the hint with the position of the distributor. That's what I thought for myself as well, but I just wanted to know, if I am right.