I just got my newly rebuilt (for the 2nd time) engine running last week again, and have been tuning it hard core over the past few days.
It's running strong and drives great at all rpm's. Initially, it was a lil' rough running and had throttle problems, but the carburetors have been tinkered with several times and the setup is now synced up pretty good.
The slight miss was still there though. A timing light showed the miss on the pulley mark as it would skip a beat about every ten flashes. I was running an original auto lite coil, but had a new spare on hand so I switched 'em.
Now, a consistent flash on #1, however the mark moves around slightly, about two deg when running. BUT...at least this showed the old coil "skipping when it should be in attendance".
If I put the timing light inductor on the #6 wire, the timing is advanced about 4 degrees that that of #1, and there still a very slight miss evident in the tail pipe at idle. The dizzy has never been rebuilt, although points and coil have been maintained. The dwell is 39 deg at idle and moves down about 5 deg when accelerated. It might be time for a new dizzy, possibly a pertronix unit... Does this now sound like a dizzy problem?