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have you checked the timing chain for wear because if the chain gear has chipped it can cause that to happen, some of those chains are made of plastic Teflon and they can brake off so I would look to see if that might be the problem, or recheck the points and the timing.
one of the cylinders is missing. It doesn't fire sometimes and when it does, you get the backfire. Check the plugs. It should be obvious which cylinder is at fault.
Backfiring on throttle-closed decelleration is usually caused by cold air being sucked into a hot exhaust systen. Check for poor seal where the downpipe meets the cylinder head, and leakage at any joints beneath the engine if it has a balance pipe. Hope that helps.
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