Use a timing light to check the initial timing setting at idle, then keep the light on the marks as you slowly increase rpm to full speed. Timing should smoothly advance until it indicates 25-30 degrees at full rpm.
If spark does not advance as rpm increase, you have found your hot exhaust problem.
If the advance mechinism is stuck, remove the point plate and soak all the advance weight pivot pins with solvent oil. Also remove the rotor and little felt disc in the end of the hollow rotor shaft, soak the hollow shaft with solvent oil. A small vice grip locking pliars lightly clamped to the rotor shaft helps work the sticky mechanism to free it. Once loose, lightly oil the weight bushings and replace the felt disc in the hollow rotor shaft. drip 3-6 drops of motor oil on this felt pad every year. Lubing that felt pad is oftem missed and is the major cause of stuck spark advance mechanism.
You should be able to grab the rotor and twist it 10-15 degrees in the direction of normal distributor rotation. The weight return springs should snap the rotor back to the idle timing position when you release it.
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