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Definatly sounds like timing to me. try turning your dist a bit either direction to see if it helps at all, may not start, but if the backfiring goes away you've found the problem.
usually if the valve isn't closing all the way you won't have much (or just bad) compression, do you have a compression gauge you can hook up in the plug port? if it's low you might be on to something with the valve lash.
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