Not Ranked
What distributor are you running? I had very similar symptoms when the rotor portion of my Pertronix unit moved up on the rotor shaft slghtly. The top of the pickup and the rotor have to be exactly even or it will not fire consistently.
Other possibility might be a severely worn distributor gear.
And, I have also attempted to set my timing to 33 degrees AFTER top dead center on another car in a murphy moment.
Gary
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