My engine and tranny are together again and will be installed in the van
tomorrow.
With some help from the list and the archives I resolved most of my
confusion; but the biggest confusion
was that I didn't recognize the existing o-ring in the flywheel because
it had worn down / conformed till it
had a completely flat face.  I thought the two slots on either side of
the o-ring were the groves the o-ring was supposed
to fit into.  Once I got the old o-ring out, it was obvious which o-ring
had to go in to replace it.
Thanks to all.

John Jensen
johnjensen@johnjensenartist.com
http://www.johnjensenartist.com
bluesbug@verizon.net