413 Backfires

1963 Imperial 413 engine with 25,546 original miles. I replaced the points, rotor, cap, condenser, plugs, ignition wires, installed a carburetor kit, installed a new intake manifold, new water pump and timed the engine. The Y pipe is on the exhaust but the muffler and tail pipe are gone and will be replaced as soon as I can solve the backfire problem. The main reason for all of this work was to detail the engine, which ran fine prior to doing this work. The car starts fine, idles fine...

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Author: RKC