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Quick question... 69 Spider drives fine but occasionally when driving I will hear a single loud backfire from the exhaust. Anything to be concerned about? Cause of this? thanks
 

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Is it SPICA or carbs?
Does it happen when you are cruising with steady throttle or when you take your foot off the gas?
 

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A cylinder not firing perhaps? Unburned fuel vapor then hits the hot exhaust, and 'boom'. Or maybe a timing issue.
 

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Common occurrence with Spica injection. You need to lift completely off gas pedal during deceleration. As I recall the cause might also be a faulty micro switch in the injection pump.
Cheers, Jon
 
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