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they should be the 41-932 plugs. AC Delco gap should be 0.060 inch. Check the gap before installing any plug. You never know if they were damaged in shipping before the part store got them, or if some idiot employee at the store attempted to juggle them while bored one day and damaged them by dropping them.
You said the problem happened right after the engine was replaced correct? If so bring number cylinder to top dead center on the compression stroke. Remove the distributor cap and see if the rotor is lined up with the number one spark plug wire. It's possible the distributor was installed 180 degrees out.