Timing could be an issue, certainly.
But the first thing I would check would be the spark plugs. How long
has it been since you changed them?
If the plugs are fouled ( typically with white combustion residue), or if
electrodes are thin or opened up beyond spec, or if you have inadvertently
installed the wrong plugs, you can get this sort of behavior.
Check your timing and advance (I assume it is adjustable on a car of that
age) while you are at it.
Dirty combustion chambers.
Mixture too lean.
and a few other things.
I'd start with timing, test the distributor for proper operation
(vacuum advance)then move to other things.
How many miles on the engine (since last rebuild, if approprirate).
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