The advance does jump around when I look at it with the timing
light.

I took the dizzy half way apart (took the thing that holds the
points off and looked square at the advance weights) and there
was enough crud inside the dizzy to make a VW bug. I cleaned
it up and greased stuff but the unsteady advance remains. The
springs seemed to be okay and the weights snapped back into
place in a manner that seemed correct.

I'm going to try to swap out another dizzy soon. In the meantime
is there any chance that I'm getting crosstalk between the plug
wires? They're a couple years old and french but they don't
seem to be leaking when I watch them at night.

Where can I get a new 6 cylinder aftermarket accel or mallory
distributor? I see that they make a B20 version but that's not
great for me.
chris