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Good advice already. The backfire is an indication that the firing order is incorrect and or the timing is way off. Have someone double check you on this before trying to start it again.
A side comment. Why throw away perfactly good plugs? Worst case bake them out in an oven set at about 250 F for an hour and they should be as good as new. If someone dissagrees with this lets start a new thread on the subject.
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