I just got back from getting my '04 F350 diesel inspected. I started a conversation with the store manager about my 1990 F150 4B project. he said I'll never get it registered/inspected in NYS with the diesel engine in it? He says he gets guys in there all the time with gassers who put a different engine in their street rods and he can't pass them even though the engine is newer than the chassis? He say he doesn't know how the 1990 F150 could be registered as a diesel because it never came with one in it. He said my best bet is to get a 1989 or older truck because any vehicle over 27 years old is exempt from any emissions inspection. Anyone try this in New York with a 1980 or newer vehicle? Guess I'll have to talk to the DMV, my favorite pastime, I just luv this state. Maybe my best bet will be to get a F250 diesel chassis at a junkyard. Luckily I haven't started tearing the 150 apart yet.