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Add my vote to the distributor gear either being gone or having sheared the pin. I've seen both on a couple of motors. The sheared pin examples gave the same kind of effects you mentioned.
Pull the distributor and look at the gear for signs of significant wear. If it looks o.k. hold the shaft with a padded set of pliers and try to turn the gear on the shaft to identify a sheared pin. Get the engine to TDC on the #1 cylinder compression stroke before you start just to make reassembly easier.
DonC
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