Do this first. SPLIT CARB DIAPHRAGM. Replace even if you don't see a split.
Weak mixture.
No oil in dashpot.
Too far advanced. Check timing properly. First set the static timing by the book and then check with the engine running using a strobe light. Pull vacuum pipe from the distributor when doing this and block it off to stop the air leak to the manifold. It may need to be retarded by a couple of degrees more than the book due to modern fuel. Initially, you could just rotate the distributor slightly to retard it. 1º of a turn at the distributor = 2º of ignition timing. Rotate anti-clockwise to retard.
Do each step separately and then test. I don't say this will cure your problem but all worth a try.
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