Pull the number one plug and shove a wadded up paper napkin in the spark plug hole. Bump the engine until the napkin pops out. Check the timing marks. It should be very close to TDC. Manually turn it so that it is. Now line up the rotor with the number one pin on the cap. It should now fire on the first turn of the key, and run just dandy. From this point, you can advance the timing to the point where you want it. If it's still backfiring, double check the valves.
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