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Backfire thru Carb and popping out the Exhaust

I've got a popping out of the exhaust and a backfire thru the Carb that I can't seem to nail down..... Recently changed the dual point distributor to an MSD unit when all this started; thought it may have been lifters so I changed them and the engine is still run bad. If anyone has some insight to this condition please help. John
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