Help please.. Won't pass NC emission inspection.. Where to begin????

[jay3000]

I just recently bought this car..It had several things wrong with that I have already fixed (unrelated)..

I've replaced the spark plugs, dist. cap, rotor, and air filter, and O2 sensor with one for a 90 302 mustang.. It's running on Premium unleaded.. The engine runs like a dream.. I don't know how it could run better..

I went today to have it inspected, and it FAILED the emissions test with flying colors..

HC 474 STANDARD IS 220
CO 6.33 STANDARD IS 1.2
CO2 11.0

Can anyone guide me down the road to acceptable emission readings???

Thanks,
Jay