Okay, here's what I did. I took a a scrap piece of aluminum, bored the center hole
a couple of thousandths bigger than the OD of the distributor, cut the OD to leave
enough depth for the threads of a couple of setscrews at 90 degrees from each
other. A word to the wise: the OD should be about the diameter of the adjustor
arm mentioned below (Didn't think of that until I was done!)
Then I took the adjuster off of one of my extra distributors that I have and
cut off the section that had bolted to the distributor housing, leaving just
the arm that bolted to the block. I figured out what angle I wanted the
arm at, then drilled a small hole through both the adjuster and the aluminum
piece, then drove in a split pin to anchor the two pieces togeter. (You can
just see the hole in the second picture on the left side where I pulled the
O-ring down a bit.
With the O-ring installed I locked the setscrews when I had the endplay
that I wanted, then can adjust timing by loosening the block bolt just like
an OEM distributor.
Sorry about the large pictures, but it was kind of hard to see the detail
on black painted parts!
Marty