I had a similar sounding problem. It turned out that my vacuum advance was
the source of the problem. The car would run great when accelerating and would
miss at steady speed. I followed all of the things that you mentioned to no
avail. I pulled the vacuum hose going to the the distributor, plugged it and
the problem was solved. I noticed know major performance problems with not
using the vacuum advance (running Webber DGV with Crane Electronic Ignition).
This was about 9 years ago so my memory may be a bit foggy, but I think this
is how I resolved it.
YMMV.
Good luck.
DCS
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