It will pass, but only if you kept all the emissions control devices from the stock motor installed.
Be sure your catalytic converter is good, use cold spark plugs and close the spark gap by 10%, replace your fuel filter, check your EGR valve, replace your PCV valve, try restricting air flow through the air filter (this will reduce NO emissions by creating richer mixtures). Replace your O2 sensor. If it doesn't detect O2 properly, then the ECM will think the mixture is rich and then compensate by leaning it more.
There's always something you can do! Good luck!
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