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.