Check your harmonic balancer, too. The ring could have moved.
It was mentioned once, but you need to confirm that the timing mark is indeed at TDC for cylinder #1. If the mark is off, everything else is moot.
Have you tried to just turn the distributor until the timing is actually at 8* BTDC with the vacuum advance disconnected and plugged?
You will probably need to turn your idle speed down if you do this, and then readjust the idle mixtures, too.
Just curious.....
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