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I just drove home a '67 mustang that I bought yesterday, and it backfires like crazy out of the exhaust on deceleration. It has a 302 w/E-brock 1406 carb, stock distributor, and some headers I haven't identified yet. Is this a problem with the carb, or does the timing need adjustment? By the way, it idles fine, but stumbles on part throttle, if that helps. Thanks.
 

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A small exhaust leak will cause this,especially if your mixture is a little rich.Take a good look at your exhaust system and headers for any holes or blown gaskets.
 

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Had same problem with my 302 running an edelbrock carb,
Advanced timing and make sure that you are useing the manifold vacuum port from the carb at the nondrivers side.( hope your pony is not british
)
I did , since than no more backfire!
 
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