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easiest way I can tell..without expensive equipment..disconnect the coil wire from the Dist. hold it against the block..and crank the engine..you should get a nice clean blue spark about half an inch long..if it has any red or yellow color..the coil is usually bad or on it's way out
 
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even easier is if you have a old spark plug gap it to .5 and put it on the wire to the dizzy cap and check the spark
 

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Oh man....lol...

I was gonna recommend you pull the coil wire and hold it while cranking the engine.....

If your hair stands up on end, it works.....if nothing happens order a new one.

:)
 
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