Sparkplugs are the correct heat range? properly gapped? Do you have the stick coils or the older coil type? If the older type check the input voltage at the smaller wires(primary side of the coils) it should be battery voltage or a little less. If the voltage is down to 8-10 volts, I'd check the electrical connectors for corrosion.
Good fuel flow from the tank petcock(gas valve) to either the FI system(if you have it) or the carbs.
Valve clearances been checked? compression good on all cylinders?
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