Sounds like your Mixture needs to be ajusted. To much gas getting to your engine would cause heavy black smoke. I recommend you have someone give it a good tune-up.
Good Luck
SOURCE: 1995 f150 lightning 351w 5.8l
1 quick check, EGR valve failure is common with 5.8, You can clean it sometimes to see that it works and if that solves your trouble, do replace it. They seem to go every 50,000 or so , usually caused by running injector cleaners that get caught in exhaust as nonburnable.
SOURCE: Fault Code : P1664
P1664 FIP (Fuel Injection Pump) malfunction (possible air ingress in low pressure fuel side)
Most likey the Diesel fuel injection pump needs to be replaced or overhauled.
SOURCE: 330 excavator with a c9 cat engine, heavy SMOKE
At the time you made all the above repairs, did you replace the "throw away" turbo charger? The turbo charger commonly sucks oil, and it is not repairable.
Run it without the inner & outer air cleaner. If it isn't the turbo, run the injector cut out test. If the injectors are ok, then you need to replace the injection system hydraulic pump, which is also unrepairable.
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